All Technical FAQs

Platform Invoke - C#

2012-02-17T10:45:00.000-08:00

A platform invoke call to an unmanaged DLL function When platform invoke calls an unmanaged function, it performs the following sequence of actions: Locates the DLL containing the function. Loads the DLL into memory. Locates the address of the function in memory and pushes its arguments onto the stack, marshaling data as required. Note Locating and loading the DLL, and locating the address of

What is Shadowing in .NET?

2012-02-17T08:58:00.000-08:00

Shadowing in .NET When a method is defined in base class are not overridable and one needs to provide different implementation for the same in derived class. In such scenario one can hide the base class implementation and provide new implementation using Shadows (VB.Net)/new(C#) keyword. Below code shows use of new keyword in C# static void Main(string[] args) { new

Why C# does not support multiple class inheritance ?

2012-02-17T08:40:00.000-08:00

Why C# does not support multiple class inheritance ? Multiple inheritances are not supported in C#. Consider the below example. public class Class1 { public string GetClass() { return "This is Class1"; } } public class Parent2 { public string GetClass() { return "This is Class2"; } } public class

What are difference between Singleton and Static class?

2012-02-17T08:19:00.000-08:00

What are difference between Singleton and Static class? Singleton Class can extend classes and implement interfaces, while a static class cannot implement the interface. Singleton can be initialized lazily or asynchronously while a static class is generally initialized when it is first loaded. Singleton class can be extended and it's methods can be overridden.

Project Management : What is Fishbone diagram or Ishikawa diagram or Cause and effect diagram ?

2012-02-04T12:02:00.000-08:00

Fishbone diagram or Ishikawa diagram or Cause and effect diagram Fishbone diagram or Ishikawa diagram or Cause and effect diagram are used to show causes of specific event. It is used for quality defect prevention and product design. Fishbone diagram illustrates how various factors lead to potential problem. Root cause is obtained by asking how and why along the lines. The common cause

Project Management : What is Pareto Chart ?

2012-02-04T11:22:00.000-08:00

Pareto Chart Pareto Chart is also known as Pareto Diagram. Pareto Chart is type of chart that contains bars and a single line. Individual values are represented by bars and cummulative total is shown by line. The left vertical axis is frequency of occurrence and right vertical axis is cummulative percentage of occurrences. The horizontal axis contains reason of occurences. Pareto chart shows

Project Management - What is Workaround plan ?

2012-02-04T10:41:00.000-08:00

Workaround plan Workaround plan is not idenfied in advance. A workaround is a solution to unidentified or unanticipated problem. It is different from Contigency or back up plan as they are solution to identified risks or problems. Workaround is used to deal with emergency risks that were not previousily identified.

Windows vs Web Application

2012-01-21T06:07:00.001-08:00

Windows vs Web Application Windows Application Rich UI application Upgrade of application difficult Web Application Less maintainance and low barrier entry Browser issues

What are the 3 things that a WCF Services end point must have?

2012-01-13T09:08:00.000-08:00

ABC are 3 things that WCFServices end point must have. "A" stands for Address: Where is the service? "B" stands for Binding: How do I talk to the service? "C" stands for Contract: What can the service do for me Address - Address specifies where is the serviceBinding - Binding specifies how to communicate with serviceContract - Contract specifies what functionalities or operations are exposed by

Why are WCF Services are considered as loosely coupled?

2012-01-13T09:02:00.000-08:00

WCF enables one to create SOA services. A loosely-coupled relationship implies that any client created on any platform can connect to any WCF service as long as the essential contracts are met. WCF Services are considered as loosely coupled because WCF services are not tightly bound to a particular protocol, encoding format, or hosting environment. All of these are configurable.

What are project management processes in Planning Process Group ?

2012-01-02T03:21:00.000-08:00

As per PMBOK guide , project management processes in Planning Process Group are listed below : Develop Project Management Plan Collect Requirements Define Scope Create WBS Define Activities Sequence Activities Estimate Activity Resources Estimate Activity Duration Develop Schedule Estimate Cost Determine Budget Plan Quality Develop Human Resource Plan Plan Communications Plan Risk Management

What is Identify Stakeholders - project management process ?

2012-01-02T00:24:00.000-08:00

Identify Stakeholders is project management process in Initiating Process Group. It is used to identify all people or organizations impacted by project. It also involves documenting information related to involvement , interest and impact on project success. Inputs for Identify Stakeholders are : Project Charter Procurement documents Enterprise environmental factors Organizational process

What is Define Project Charter - project management process ?

2012-01-01T23:53:00.000-08:00

Define Project Charter Define Project Charter is a project management process in Initiating Process Group . Define Project Charter is process for developing a document which authorizes a project or phase. It also has initial requirements which meets stakeholder's needs and expectations. Inputs for Define Project Charter are below : Project Statement of Work Business Case Contract Enterprise

What are project management processes in Initiating Process Group ?

2012-01-01T23:31:00.000-08:00

As per PMBOK 4th edition guide , there are two project management processes in Initiating Process Group : Develop Project Charter Identify Stakeholders

What are Project Management Process Group ?

2012-01-01T22:44:00.000-08:00

The PMBOK guide defines the 5 project management process groups as follows Initiating Process Group: Defines and authorizes the project Planning Process Group: Plans the course of action required to attain project objectives and define the scope of the Project. Executing Process Group: Integrates people and other resources to carry out the project plan for the project. Monitoring and

Programming with word in C# : Replace bookmark with actual values

2011-12-29T08:54:00.000-08:00

Step 1 : Add a bookmark to work document ( for example StudentLetter.doc ) Click where you want to insert a bookmark. On the Insert tab, in the Links group, click Bookmark. Under Bookmark name, type a name. For example StudentName Click Add. Step 2 : Create a C# project and Add reference to Microsoft Word Object Library Start Microsoft Visual Studio 2005 or Microsoft Visual Studio .NET.

Error : dll file is being used by another process

2011-12-29T08:28:00.000-08:00

Error : Unable to copy file XYZ.dll. The process cannot access the file XYZ.dll because it is being used by another process Resolution : Go to windows command prompt ( Click on Start -> Run -> Type cmd -> Press OK ) Type tasklist /m and Press enter The above command will list all the process i.e exe and dlls each process is using Find out which process i.e exe is using the dll XYZ.dll Then

Eclipse Download & Setup

2011-12-03T08:34:00.000-08:00

1. Eclipse can be downloaded from blow site : http://www.eclipse.org www.eclipse.org 2. Click on Download link of Eclipse Home page Eclipse Downloads 3. Click on Eclipse IDE for Java Developers - Windows 32 Bit link on Eclipse Downloads page. 4. Click on Download icon on Eclipse downloads - mirror selection page and zipped file called

Overview of XML Support in SQL Server versions

2011-11-01T07:25:00.000-07:00

XML Support in SQL Server versions SQL Server 2000 OpenXML - XML Decomposition to Relational Select ... FORXML - Relational Composition to XML Server side XPath Queries SQL Server 2005 XML Data type XML Schema Collections XQuery Support Web Release Functionality combined into SQLXML4

XML in relational database

2011-11-01T07:14:00.000-07:00

How XML can be stored in relational database ? There are three ways XML can be stored in relational database. 1. XML can stored as text . XML can be stored in text and varchar colums of table. But , it will lose much of value of XML representation. This can be used with any version of SQl server 2. XML can decomposed and stored in multiple relational tables. This alows use of relational

State different generic collections defined in System.Collections.Generic Namespace ?

2011-09-14T10:07:00.000-07:00

Different generic collections defined in System.Collections.Generic Namespace are listed below : List<T> - Represents a strongly typed list of objects that can be accessed by index. Dictionary<TKey, TValue> - Represents a collection of keys and values HashSet< T> - Represents a set of values. LinkedList< T> - Represents a doubly linked list. Queue<T> - Represents a first-in, first-out

Difference between Close and Abort in WCF Client Channels

2011-09-04T08:13:00.000-07:00

Close Vs Abort Difference between Close and Abort in WCF Channels are listed below : Close performs graceful shutdown of Client Channel vs Abort shut downs Client channel immediately. Close waits for in progress calls to complete before closing where as Abort ends in progress calls. Close should not be called in faulted channels as it can throw Communication or Timeout exception where as

Difference between REST vs SOAP

2011-09-04T08:04:00.000-07:00

REST vs SOAP REST uses transport specific ( HTTP ) model whereas SOAP uses transport neutral model. REST is focused on resources whereas SOAP is focused on custom messages.

Message Exchange Patterns in WCF

2011-09-03T12:07:00.000-07:00

Message Exchange Patterns in WCF There are three message exchange patterns in WCF : One way Request Reply Duplex

Aggregate functions in LINQ query

2011-09-03T11:36:00.000-07:00

Aggregate functions in LINQ query Avearage - Returns the average value in sequence Count - Returns count of elements in sequence Max - Returns maximum value in sequence Min - Returns minimum value in sequence Sum - Returns sum of values in sequence Aggregate - Computes custom aggregation in sequence