Jeremiah Flaga

I moved my blog (again) :)

2017-04-01T08:51:00.000-07:00

I moved my blog again. This time to GitHub Pages.

Happy coding!!

My new blog - jboyflaga2.blogspot.com

2016-07-26T23:17:00.000-07:00

Hi!

My blog is now located at jboyflaga2.blogspot.com.

Solution to error on "kpm restore": Unable to locate [package]

2014-12-25T16:46:00.004-08:00

When I tried to run "kmp restore" on a vNext project I got these error messages like in the picture below:

Unable to locate [package]

The solution is to create a Nuget.config file that contains the package source for vNext at the root of your solution

<packageSources>
<add key="AspNetVNext" value="https://www.myget.org/F/aspnetvnext/" />
<add key="NuGet.org" value="https://nuget.org/api/v2/" /></packageSources>

Tried to do "Algorithms, Part I" of Princeton at Coursera

2014-05-01T10:20:00.000-07:00

I tried to do "Algorithms, Part I" of Princeton at Coursera last February, but I completed only until week 4.

Here are the screenshots of the assignments that I completed:

I completed a free course: "Introduction to Databases" from Stanford Online

2014-03-16T11:28:00.000-07:00

Yeey!!! I completed "Introduction to Databases" from Stanford Online (last March 15, 2014)!

"Introduction to Databases" About page:

https://class.stanford.edu/courses/Engineering/db/2014_1/about

What is the ii/IV - V/IV - IV progression

2013-11-30T09:12:00.000-08:00

ii/IV is read as "two of four" which is Gm7 in the key of C.

V/IV is read as "five of four" which is C7 in the key of C.

and IV is F in the key of C.

You can find an example of this by Greg Howlett on thins link.

Free Lessons for Chruch Pianists:
Free lessons, tips and downloads for church pianists

DVD Courses (Reharmonization, Play by Ear!, Arranging, Accompanying, Theory for Church Pianists, etc.):
Over 30 hours of DVD instruction for church pianists

How to install Ruby on Rails offline in Windows 7 and use WEBrick as web server

2013-11-10T09:01:00.000-08:00

When online

Download railsinstaller-2.2.1.exe from http://railsinstaller.org/
Download uglifier-2.2.1.gem from http://rubygems.org/gems/uglifier

When offline (on another computer)

Execute railsinstaller-2.2.1.exe
Open command window
Using the command window, navigate to the directory where uglifier-2.2.1.gem is saved

cd <path where uglifier-2.2.1.gem is saved>

Type the following command:

gem install --local uglifier-2.2.1.gem

Create your Rails site with the following command:

rails new <name of your site>

Using the command window, navigate to the directory of your site:

cd <path of your site>

While inside your site's directory, run the web server (WEBrick):

rails server

Open your web browser to view your site: http://localhost:3000/

From Nand to Tetris - My Solutions to the Projects

2013-06-11T01:00:00.000-07:00

I have created a repository to contain my solutions to the projects of the course "From Nand to Tetris"
(You can also get the reading materials and projec files at http://www.cs.huji.ac.il/course/2002/nand2tet/projects.html)

Here is the repository of my solutions: https://github.com/jboyflaga/Nand2Tetris
(Some of my solutions are not very good even though the output is still correct. Be sure to also look at other people's solutions for reference.)

UPDATE (November 17, 2013): I deleted the GitHub repository of my solutions to the Nand2Tetris projects 1 to 8 because someone who is teaching it (Alex Lipov) requested for it to be removed because it violated the course terms (http://www.nand2tetris.org/terms.php).

If you want to know how to start the course just read the whole Chapter 1 available in http://www.nand2tetris.org/course.php or http://www.cs.huji.ac.il/course/2002/nand2tet/projects/proj1.html. You will know what to do especially after you read the last part of chapter 1.

Enjoy!!!

From Nand to Tetris - Project 4 (Fill)

2013-05-31T01:21:00.000-07:00

This is my solution to the exercises (Fill) in Project 4 of the free course From Nand to Tetris
Other Links:
http://www.cs.huji.ac.il/course/2002/nand2tet/projects.html

// Runs an infinite loop that listens to the keyboard input. 
// When a key is pressed (any key), the program blackens the screen,
// i.e. writes "black" in every pixel. When no key is pressed, the
// program clears the screen, i.e. writes "white" in every pixel.

// (RESET_SCREEN_COUNTER)
 // @SCREEN
 // D=A
 // @counter
 // M=D    // counter = SCREEN

(LISTEN_FOR_NO_KEY_PRESS)
 // reset screen counter
 @SCREEN
 D=A
 @counter
 M=D
 
 // if KBD == 0 jump to CLEAR_SCREEN
 @KBD
 D=M
 @CLEAR_SCREEN
 D;JEQ

 // loop (keep on checking if KBD == 0
 @LISTEN_FOR_NO_KEY_PRESS
 0;JEQ

(LISTEN_FOR_KEY_PRESS)
 // reset screen counter
 @SCREEN
 D=A
 @counter
 M=D
 
 // if KBD > 0 jump to BLACKEN_SCREEN
 @KBD
 D=M
 @BLACKEN_SCREEN
 D;JGT
 
 // loop (keep on checking if KBD > 0
 @LISTEN_FOR_KEY_PRESS
 0;JEQ
 
(BLACKEN_SCREEN) 
 // blacken 16-bit memory location
 @counter
 A=M    // A = counter
 M=-1   // blacken current memory location
  
 // if KBD == 0 jump to LISTEN_FOR_NO_KEY_PRESS (to reset counter)
 @KBD
 D=M
 @LISTEN_FOR_NO_KEY_PRESS
 D;JEQ

 // increment counter
 @counter
 M=M+1
 
 // check if you have reached memory location 24575 (the final address for the screen)
 D=M
 @24575
 D=A-D
 @LISTEN_FOR_NO_KEY_PRESS
 D;JLT   // goto LISTEN_FOR_NO_KEY_PRESS if counter > 24575
 
 // loop BLACKEN_SCREEN if you have NOT reached memory location 24575
 @BLACKEN_SCREEN
 0;JEQ 

(CLEAR_SCREEN)
 // clear 16-bit memory location
 @counter
 A=M    // A = counter
 M=0    // clear current memory location
 
 // if KBD > 0 jump to LISTEN_FOR_KEY_PRESS (to reset counter)
 @KBD
 D=M
 @LISTEN_FOR_KEY_PRESS
 D;JGT
 
 // increment counter
 @counter
 M=M+1
 
 // check if you have reached memory location 24575 (the final address for the screen)
 D=M
 @24575
 D=A-D
 @LISTEN_FOR_KEY_PRESS
 D;JLT   // goto LISTEN_FOR_KEY_PRESS if counter > 24575
 
 // loop CLEAR_SCREEN if you have NOT reached memory location 24575
 @CLEAR_SCREEN
 0;JEQ

The Humans Project - using the HotTowel SPA template

2013-05-03T01:07:00.001-07:00

This is a very very simple app I created to practice developing a SPA (Single Page App).

I used the HotTowel SPA template created by John Papa.
To learn more about HotTowel go to http://www.johnpapa.net/hottowel/.

HotTowel uses the Durandal SPA framework
To know more about Durandal go to the folowing pages:
http://durandaljs.com/pages/get-started
http://durandaljs.com/pages/videos/

The project is available on github.

(This is not yet finished)
(And pardon the look of the pages... I'm not a very good designer...)

Using X509Certificate2UI.SelectFromCollection() with WPF and MVVM

2013-05-02T01:05:00.005-07:00

I had a task which involves making the user select a certificate from the store.
(We are using .NET)

I used WPF and the MVVM pattern for the UI; and I used the MVVM Light Toolkit to help with MVVM development.

I used the X509Certificate2UI.SelectFromCollection() method to show a dialog for the user to select a certificate (X509Certificate2UI is in the System.Security.Cryptography.X509Certificates namespace, System.Security.dll assembly)

X509CertificateCollection certificateCollection = X509Certificate2UI.SelectFromCollection(
                    store.Certificates, "Caption", "Message",
                    X509SelectionFlag.SingleSelection);

My problem was the dialog that X509Certificate2UI.SelectFromCollection() is not modal and it does not close when I close the main window.

The solution was to use the overloaded method of X509Certificate2UI.SelectFromCollection() which accepts a handle to the parent window.

WindowInteropHelper windowHwnd =new WindowInteropHelper(this); 
IntPtr hWnd = windowHwnd.Handle;
X509CertificateCollection certificateCollection = X509Certificate2UI.SelectFromCollection(
                    store.Certificates, "Caption", "Message",
                    X509SelectionFlag.SingleSelection, hWnd);

[To know more about Win32 Handles go to "Win32 Handle (HWND) & WPF Objects - A Note" - http://www.abhisheksur.com/2010/12/win32-handle-hwnd-wpf-objects-note.html ...]

But there was another problem: Because I was using MVVM with WPF I have to put this logic inside my ViewModel. But ViewModel does not have direct acces to the Window element!

The solution was to pass the Window object as parameter to a Command object as shown below

[The View - XAML]

<Window ...  Name="TheMainWindow"
   DataContext="{Binding Main, Source={StaticResource Locator}}">
  <Button Command="{Binding SelectCertificateCommand}" CommandParameter="{Binding ElementName=TheMainWindow}" Content="Select Certificate From the Store" />
 </Window>

[The ViewModel]
[ViewModelBase and RelayCommand are from the MVVM Light Toolkit]

    public class MainViewModel : ViewModelBase
    {
        private X509Certificate2 _selectedCertificate;

        public ICommand SelectCertificateCommand { get; private set; }

        public MainViewModel()
        {
            this.SelectCertificateCommand = new RelayCommand(
                (window) =>
                {
                    X509Certificate2 cert = PickCertificate(StoreLocation.CurrentUser, StoreName.My, window);
                    if (cert != null)
                    {
                        this.Certificate = cert;
                    }
                });
        }

        public X509Certificate2 Certificate
        {
            get { return _selectedCertificate; }
            set
            {
                if (_selectedCertificate == value) { return; }
                _selectedCertificate = value;
                RaisePropertyChanged(() => Certificate);
            }
        }

        private static X509Certificate2 PickCertificate(StoreLocation location, StoreName name, Window window)
        {
            X509Store store = new X509Store(name, location);
            try
            {
                store.Open(OpenFlags.ReadOnly);

                // pick a certificate from the store 
                X509Certificate2 certificate = null;
                X509CertificateCollection certificateCollection = X509Certificate2UI.SelectFromCollection(
                    store.Certificates, "Select a certificate", "Select a certificate",
                    X509SelectionFlag.SingleSelection, new WindowInteropHelper(window).Handle);
                if (certificateCollection.Count > 0)
                {
                    certificate = (X509Certificate2)certificateCollection[0];
                }

                return certificate;
            }
            finally
            {
                store.Close();
            }
        }
    }

Public Key Encryption and Digital Signature: How do they work?

2013-04-27T08:46:00.000-07:00

I recently had a task which involves Encryption and Digital Signature. This paper from CGI.com is one of the things that helped me understand how public key encryption and digital signatures work.

http://www.cgi.com/files/white-papers/cgi_whpr_35_pki_e.pdf

I hope this also will help you.

My solution to chapter 12 exercises of JavaScript Step by Step 2e

2013-04-08T03:19:00.000-07:00

1. Create a webpage that sends a cookie to the browser. Set the expiration date ahead
one day. Verify that the JavaScript code sent the cookie to the browser by viewing it as
it gets set or after it’s been stored on the computer. You could accomplish this second
part of the exercise; by using JavaScript or by viewing the cookies on the computer.

 <!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
</head>
<body>
    <script>
        var cookieName = "mycookie-1";
        var cookieValue = "mycookievalue-1";
        var date = new Date();
        date.setTime(date.getTime() + (24 * 60 * 60 * 1000));
        var expireDate = date.toGMTString();

        var myCookie = cookieName + "=" + cookieValue + ";expires=" + expireDate;
        document.cookie = myCookie;

        // the following code is not part of exercise 1
        // another cookie
        var cookieName2 = "mycookie-another";
        var cookieValue2 = "mycookievalue-another";
        var date2 = new Date();
        date2.setTime(date2.getTime() + (24 * 60 * 60 * 1000));
        var expireDate2 = date2.toGMTString();

        var myCookie2 = cookieName2 + "=" + cookieValue2 + ";expires=" + expireDate2 + ";path=/;domain=localhost;";
        document.cookie = myCookie2;
       
        alert(document.cookie);
    </script>
</body>
</html>

2. Create a webpage that sends a cookie with the cookie’s expiration date set ahead one
week, and set the secure flag. This page can be the same one you created for Exercise
1, but be sure to give the cookie a different name so that you’ve created two separate
cookies, one for each exercise. Also, be sure to enable the secure flag for the cookie in
this exercise, not for the cookie in Exercise 1.

 <!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
</head>
<body>
    <script>
        var cookieName = "mycookie-2";
        var cookieValue = "mycookievalue-2";
        var date = new Date();
        date.setTime(date.getTime() + (7 * 24 * 60 * 60 * 1000));
        var expireDate = date.toGMTString();

        var myCookie = cookieName + "=" + cookieValue + ";expires=" + expireDate + ";secure";
        document.cookie = myCookie;
    </script>
</body>
</html>

3. Create a webpage that attempts to read the cookie with the secure flag set. Did you
receive the cookie? If not, what would you need to do to receive it?

 <!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
</head>
<body>
    <script>
        var cookies = document.cookie.split(";");
        var cookLength = cookies.length;
        for (var c = 0; c < cookLength; c++) {
            alert(cookies[c]);
        }
    </script>
</body>
</html>

4. Create a webpage that reads the cookie you created in Exercise 1. Use a for loop and an
if conditional to display an alert() dialog box when the cookie with the correct name is
found within the loop. Don’t display an alert() dialog box for any other cookies.

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
</head>
<body>
    <script>
        var cookies = document.cookie.split(";");
        var cookLength = cookies.length;
        for (var c = 0; c < cookLength; c++) {
            var pairs = cookies[c].split("=");
            var cookieName = pairs[0];
            var cookieValue = pairs[1];

            // display only the cookie with name of "mycookie-1"
            if (pairs[0] === "mycookie-1") {
                alert("Name: " + cookieName + " -> " + "Value: " + cookieValue);
            }
        }
    </script>
</body>
</html>

My solution to chapter 11 exercises of JavaScript Step by Step 2e

2013-04-08T03:16:00.001-07:00

1. Create a webpage that contains an onclick event handler connected to a link using a
DOM 0 inline event. The event handler should display an alert stating “You Clicked
Here”.

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
</head>
<body>
    <a href="#" onclick="alert('You Clicked Here');">This is a link</a>
</body>
</html>

2. Change the webpage created in Exercise 1 to use the newer style of event handling
shown in ehandler.js (in the companion content) and connect the same click/onclick
event to display the alert created in Exercise 1.

 <!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <script src="../../Scripts/ehandler.js" type="text/javascript"></script>
</head>
<body>
    <a id="link1" href="#">This is a link</a>

    <script type="text/javascript">
        function showAlert() {
            alert("You Clicked Here");
        };
        var link1 = document.getElementById("link1");
        EHandler.add(link1, "click", showAlert);       
    </script>
</body>
</html>

3. Create a webpage with a link to http://www.microsoft.com. Make that link open in a
new tab.

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
</head>
<body>
    <a href="http://www.microsoft.com." target="_blank">http://www.microsoft.com</a>
</body>
</html>

My solution to chapter 10 exercises of JavaScript Step by Step 2e

2013-03-22T06:22:00.000-07:00

This is my solution to Chapter 10 programming exercises of JavaScript Step by Step 2e.

1. Create a document containing a paragraph of text that you create and append using
the DOM. Create a link immediately after this paragraph that links to a site of your
choice, also using the DOM. Make sure that all the elements have id attributes.

JavaScript:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    
</head>
<body>
    <script type="text/javascript">
        // create <p> the append to body
        var element = document.createElement("p");
        element.setAttribute("id", "p1");
        element.textContent = "I am a p";
        document.body.appendChild(element);

        // create <a> then append to body
        element = document.createElement("a");
        element.setAttribute("id", "a1");
        element.setAttribute("href", "http://jeremiahflaga.blogspot.com");
        element.textContent = "this is my blog";
        document.body.appendChild(element);
    </script>
</body>
</html>

TypeScript:

// create <p> the append to body
var element: HTMLParagraphElement = <HTMLParagraphElement>document.createElement("p");
element.setAttribute("id", "paragraph1");
element.textContent = "I am a paragraph";
document.body.appendChild(element);

// create <a> then append to body
var element2: HTMLAnchorElement= <HTMLAnchorElement>document.createElement("a");
element2.setAttribute("id", "anchor1");
element2.setAttribute("href", "http://jeremiahflaga.blogspot.com");
element2.textContent = "this is my blog";
document.body.appendChild(element2);

2. Create a document with any elements you like, or use an existing HTML document that
contains id attributes in its elements. Retrieve two of those elements, make changes to
them, and put them back into the document. The type of change you make depends
on the type of element you choose. For example, if you choose an a element, you might
change the href; if you choose a p element, you might change the text.

JavaScript:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    
</head>
<body>
    <p id="p1">I am a p</p>
    <a id="a1" href="http://jeremiahflaga.blogspot.com">this is my blog</a>

    <script type="text/javascript">
        // change text of <p>
        var element = document.getElementById("p1");
        element.textContent = "I am a p of exercise #2";
        document.body.appendChild(element);

        // change text of <a>
        element = document.getElementById("a1");
        element.setAttribute("href", "http://www.johnpapa.net/");
        element.textContent = "Click here to go to John Papa's blog";
        document.body.appendChild(element);
    </script>
</body>
</html>

TypeScript:

// change text of <p>
var element: HTMLParagraphElement = <HTMLParagraphElement>document.getElementById("p1");
element.textContent = "I am a p of exercise #2 - from typescript";
document.body.appendChild(element);

//  change text of <a>
var element2: HTMLAnchorElement = <HTMLAnchorElement>document.getElementById("a1");
element2.setAttribute("href", "http://www.johnpapa.net/");
element2.textContent = "Click here to go to John Papa's blog - from typescript";
document.body.appendChild(element2);

3. Create a document by using the DOM that contains a table with at least two columns
and two rows. Add some text in the table cells.

JavaScript:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    
</head>
<body>
    <script type="text/javascript">
        // create <table> the append to <body>
        var table = document.createElement("table");
        document.body.appendChild(table);
        table.setAttribute("border", 1);

        // create <tr> (row) then append to <table>
        var row = document.createElement("tr");
        table.appendChild(row);

        // create <td> (cell) then append to <tr>
        var cell = document.createElement("td");
        row.appendChild(cell);
        cell.textContent = "Cell #1";

        // create <tr> (row) then append to <table>
        var row = document.createElement("tr");
        table.appendChild(row);

        // create <td> (cell) then append to <tr>
        var cell = document.createElement("td");
        row.appendChild(cell);
        cell.textContent = "Cell #2";
    </script>
</body>
</html>

TypeScript

// create <table> the append to <body>
var table: HTMLTableElement = <HTMLTableElement>document.createElement("table");
document.body.appendChild(table);
table.setAttribute("border", "1");

// create <tr> (row) then append to <table>
var row: HTMLTableRowElement = <HTMLTableRowElement>document.createElement("tr");
table.appendChild(row);

// create <td> (cell) then append to <tr>
var cell: HTMLTableCellElement = <HTMLTableCellElement>document.createElement("td");
row.appendChild(cell);
cell.textContent = "Cell #1 - from typescript";

// create <tr> (row) then append to <table>
row = <HTMLTableRowElement>document.createElement("tr");
table.appendChild(row);

// create <td> (cell) then append to <tr>
cell = <HTMLTableCellElement>document.createElement("td");
row.appendChild(cell);
cell.textContent = "Cell #2 - from typescript";

My solution to chapter 9 exercises of JavaScript Step by Step 2e

2013-03-22T06:14:00.005-07:00

This is my solution to Chapter 9 programming exercises of JavaScript Step by Step 2e.

1. Use the availHeight and availWidth methods to determine whether a screen is at least 768 pixels high and 1024 pixels wide. If it’s not, display an alert() dialog box stating the size of the available screen.

JavaScript:

if (screen.availHeight < 768 && screen.availWidth < 1024) {
    alert("Available height: " + screen.availHeight + "\n"
        + " Available width: " + screen.availWidth);
}

TypeScript: same as above

2. Alter the step-by-step exercise that used the location object to display an alert() dialog box based on the values of the query string. Specifically, display the word “Obrigado” if the country is specified as Brazil, and display “Thank you” if the country is Great Britain. Test these conditions.

JavaScript:

if (location.search) {
    var querystring = decodeURI(location.search).substring(1);
    var splits = querystring.split('&');
    for (var i = 0; i < splits.length; i++) {
        var splitpair = splits[i].split('=');
        if (splitpair[0].toLowerCase() === 'country') {
            if (splitpair[1].toLowerCase() === 'brazil') {
                alert('Obrigado');
            }
            else if (splitpair[1].toLowerCase() === 'great britain') {
                alert('Thanks you');
            }
        }
    }
}

TypeScript:

if (location.search) {
    var querystring: string = decodeURI(location.search).substring(1);
    var splits: string[] = querystring.split('&');
    for (var i = 0; i < splits.length; i++) {
        var splitpair: string[] = splits[i].split('=');
        if (splitpair[0].toLowerCase() === 'country') {
            if (splitpair[1].toLowerCase() === 'brazil') {
                alert('Obrigado');
            }
            else if (splitpair[1].toLowerCase() === 'great britain') {
                alert('Thanks you');
            }
        }
    }
}

My solutions to programming exercises in JavaScript Step by Step 2e - Chapters 4 to 8

2013-03-13T01:58:00.000-07:00

Even though I have already studied JavaScript in the past, I have never really done programming exercises using it. So I solved the exercises of JavaScript Step by Step 2e.

Because I am also currently learning Typescript, I solved the exercises, starting on chapter four, using both JavaScript and TypeScript.
(You can learn about TypeScript in John Papa's Blog - http://www.johnpapa.net/typescriptpost/)

You can download my solutions to chapters 4 to 8 here.

Sample code (Chapter 8 Exercise #2)
2. Create an object to hold the names of three of your favorite songs. The objects should have properties containing the artist, the song length, and the title for each song.

JavaScript:

function Song(artist, length, title) {
    this.artist = artist;
    this.length = length;
    this.title = title;
}

var songs = new Object;
songs.song1 = new Song("artist1", 101, "title1");
songs["song2"] = new Song("artist2", 102, "title2");
songs["song3"] = new Song("artist3", 103, "title3");

for (var i in songs) {
    alert(i + "=" + songs[i].title);
}

TypeScript:

class Song {
    private _title: string;

    artist: string;
    length: number;

    constructor(artist: string, length: number, title: string) {
        this.artist = artist;
        this.length = length;
        this._title = title;
    }

    get title(): string {
        return this._title;
    }

    set title(value: string) {
        if (value == undefined) throw 'value for title is undefined';
        this._title = value;
    }
}

var songs = new Object();
songs["song1"] = new Song("artist1", 101, "title1");
songs["song2"] = new Song("artist2", 102, "title2");
songs["song3"] = new Song("artist3", 103, "title3");

for (var i in songs) {
    alert(i + "=" + songs[i].title);
}

Simple Student Information System using ASP.NET MVC4 (w/ C#)

2012-11-29T01:00:00.002-08:00

I created a practice project where I use my new knowledge on Entity Framework Code First, the Repository and Unit of Work patterns with ASP.NET MVC4 and Unit Testing including mocking with Moq.

I published it on GitHub.
~~(Not yet finished)~~(I think I am finished with the thing I wanted to practice on - using the Repository and Unit of Work patterns)

There are functionalities that are not yet implemented in this project:
1. Updating the list of Degrees
2. Updating the list of Subjects
3. Updating the list of Semesters, Periods and Levels
4. Roles and permissions - for now, anybody can register, login and update student records.
(also, Unit Testing is not yet completed)

I have to set aside this project for a while because there are other things I need to study.

If you are interested, you can view/download/fork it from here: https://github.com/jboyflaga/StudInfoSys.AspNetMvc4.git

Error in Connecting to a Sitecore Web site through Sitecore Rocks

2012-10-31T07:24:00.002-07:00

When I tried to create a new Sitecore Rocks connection to a Sitecore web site with the values specified in the image below, the following error occured:

The Web site does not respond.

It looks like the server address is a local web site. If the web site is running on ASP.NET Development Server, the server may not have been started yet.

Do you want to retry?

You might have already guessed the reason for this error.

But if you are like me who is not yet very experienced with configuring websites and who sometimes forgets what a "host name" is, here is the solution to that problem:

The "host name" here is the same as the "host name" of your website in IIS

Object of type 'System.Int32' cannot be converted to type 'System.Web.Security.Cryptography.Purpose'

2012-10-30T19:40:00.001-07:00

After installing Visual Studio 2012 and .NET Framework 4.5 an error occurs when logging in in Sitecore (Version 6.4):

Object of type 'System.Int32' cannot be converted to type 'System.Web.Security.Cryptography.Purpose'

To fix this, change this setting in the web.config file from true to false:


<setting name="Login.RememberLastLoggedInUserName" value="false" />

This fix is from the comments section of this blog post: http://kamranicus.com/Blog/Posts/45/sitecore-and-net-framework-45

also: http://truncatedcodr.wordpress.com/2012/06/20/fix-sitecore-and-net-framework-4-5/

My First KnockoutJS Excercise

2012-10-16T01:57:00.001-07:00

I am currently practicing KnockoutJS

Take a look at it: http://jsfiddle.net/jboyflaga/uhSmM/4/

I've updated my first knockout exercise to make use of control of flow binding: http://jsfiddle.net/jboyflaga/uhSmM/7/

After Evolution, What's Next

2012-09-01T09:40:00.000-07:00

Today, if you do not believe in evolution you are considered unscientific by many intellectuals.

But some intellectuals today are starting to realize that what they observe today does no agree with evolution.

Because humans have the tendency to invent things just to convince themselves that God does not exists - What's next, then, to (macro)evolution?

I think what's next will be this: Intelligent Design where the intelligent designer are extraterrestrials (or aliens from outer space).

The next generation is being brainwashed into this kind of thinking. People are trying to create STORIES (no real evidence) that are very convincing to make themselves and others believe that aliens from other planets exist.

(Dr. Greg Bahnsen presented a very compelling evidence on the existence of the God of the Bible on

The Great Debate: Does God Exist?)

ASP.NET MVC 3 (w/ C#): Student Information System

2012-05-21T17:29:00.002-07:00

This is a simple Student Information System I created using ASP.NET MVC 3 and C#.

You can download the zip file here.

Because I'm new to ASP.NET MVC, I will list some interesting things for beginners that I used in this project:

Adding attributes to entity classes generated by Entity Framework
Creating AJAX search form
Using Html.DropDownListFor() helper
Using jQuery UI Datepicker

Simple Student Information System Using .NET WinForms & DataSet

2012-05-19T06:42:00.003-07:00

This is a simple Student Information System I created using the .NET Framework
- Windows Forms for the GUI and DataSet for data access.
- .NET language used: VB.NET

You can download this on Google Docs

You don't need to install the database used in this project because the Visual Studio Solution is configured to copy the database in the "Debug" folder and the application is configured to look for the database in the directory where the executable is located.

Username: admin
Password: admin

Happy coding!!!

ASP.NET MVC ERROR: Store update, insert, or delete statement affected an unexpected number of rows (0).

2012-05-15T13:56:00.002-07:00

Server Error in '/' Application.

Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.

Possible Problem:
You placed a ReadOnlyAttribute in you entity key's metadata, which causes its value to become zero

     [DisplayName("Student ID")]
     [ReadOnly(true)]
     public int StudentID { get; set; }

Solution:
Remove the ReadOnlyAttribute

     [DisplayName("Student ID")]
     public int StudentID { get; set; }

For other possible causes for this problem and possible solutions, please refer to this link http://stackoverflow.com/questions/1836173/entity-framework-store-update-insert-or-delete-statement-affected-an-unexpec

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