YongGang Meng's Weblog

The difference between Equals and ==

Yonggang Meng — Fri, 06 Aug 2010 00:23:00 GMT

Today, I saw an article about Equals and ==, something confuses me. http://forums.asp.net/t/1511559.aspx So I do it myself. 1: static void Main( string [] args) 2: { 3: DoEQ(); 4: Console.ReadLine(); 5: } 6: 7: private static void DoEQ(...(read more)

Two ways to make CommandArgument have value in GridView

Yonggang Meng — Mon, 12 Jul 2010 10:08:04 GMT

We all know that CommandArgument Property can remember value or index, but sometimes, there's nothing in it, do you know why? Today, i study for a while, and i find the following two ways. Use <asp:ButtonField CommandName="CMD" />, the CommandArgument...(read more)

Know more about Assembly

Yonggang Meng — Tue, 09 Mar 2010 07:19:00 GMT

If you want to know what an assembly does, you can use Reflector to refactor the assembly and check the codes. If you want to know why binding assembly failed, you can use Assembly Binding Log Viewer to check it. Also you should set HKLM\Software\Microsoft...(read more)

Get the last day of the month use javascript in VS2008

Yonggang Meng — Wed, 11 Nov 2009 03:47:00 GMT

I have a function which returns the last day of a month. The function is like this: In Javascript Editor , it works like the above picture. But in VS2008, it's strange. I am very strange for this, then I Bing , http://www.w3schools.com/jsref/jsref_parseInt...(read more)

Use UdpClient to send and receive message

Yonggang Meng — Thu, 21 May 2009 23:05:00 GMT

Client to receive message sent by server: 1: using System; 2: using System.Collections.Generic; 3: using System.ComponentModel; 4: using System.Data; 5: using System.Drawing; 6: using System.Linq; 7: using System.Text; 8: using System.Windows.Forms; 9...(read more)

Excel data type seems strange when use ado.net to select

Yonggang Meng — Thu, 21 May 2009 21:59:00 GMT

Recently, we need import some data from excel to Oracle database. A strange thing confused me. The excel file has a column, for example PhoneNumber, the format is 999999, here are some example data: 123456 234561 345612 456123 561234 612345 000123...(read more)

Problem about SQLite and Linq to Entities

Yonggang Meng — Mon, 30 Mar 2009 06:29:00 GMT

I have a web project developed in VS2008, which use System.Data.SQLite for .Net 2.0 and Linq to Entities to access data. Here is the source layout: You can see that i have a SQLite database Test_DB.db3 in SQLite folder. In my develop machine, i use connectiongstring...(read more)

Export data to excel or word

Yonggang Meng — Wed, 04 Mar 2009 06:14:00 GMT

In the actual develpment, we offen encounter such a problem about exporting data to excel or word, especially excel. I can export data to excel from gridview, but i can not apply styles to the excel cell. Last week, i found how to set the style. For example...(read more)

SQL 表信息问题

Yonggang Meng — Fri, 28 Nov 2008 11:54:00 GMT

若要查看表的列名，可以使用 sp_help 或下列查询之一：SELECT name FROM sys.columns WHERE OBJECT_ID IN (SELECT OBJECT_ID ('table_name')) 或 SELECT TOP 0 * FROM table_name。 1. Execute sp_help tablename 如: Execute sp_help 'Schedule' 2. Select Top 0 * From tablename 如：Select Top...(read more)

How to invoke PageMethods in MasterPage

Yonggang Meng — Thu, 13 Nov 2008 11:51:00 GMT

I have a web project, in the project, there is a MasterPage and some WebContentPages. In the MasterPage, there is a function, when you click a button, show or hide the left content.When you refresh or navigate other WebContentPage, the left content keeps...(read more)

ModelPopupExtender的一个问题解决方案

Yonggang Meng — Fri, 07 Nov 2008 15:22:00 GMT

最近用ModelPopupExtender时，总是提示我有 Sys.InvalidOperationException 未通过 Sys.UI.DomEvent.addHandler 的错误，后来发现是我设置了CancellControlID，而没有设置相应的事件，我是通过在服务器端Show和Hide来控制的，这样脚本在寻找CancellControlID的时候就找不到了，就为null，在脚本中就会抛出以上错误。所以，如果我们要在服务器端控制ModelPopupExtender，不要设置ControlId就可以了...(read more)

Asp.Net Web开发需要了解的知识

Yonggang Meng — Thu, 06 Nov 2008 12:45:00 GMT

很久没有做Web开发了，本以为有以前的基础加上WinForm的开发经验，Web应该不是什么问题的，应该很Easy。但是现在我发现我错了，Web开发已经不是简单的事情了。现在Web开发出来的一些优秀产品已经比较接近WinForm了，这就提高了Web开发的门槛。所以，现在如果我们想做好Web的开发，至少应该了解以下几方面的开发知识： Asp.Net Asp.Net Ajax Asp.Net Ajax Client Library Asp.Net Ajax Future Controls and Ajax...(read more)

A question about Page Header

Yonggang Meng — Thu, 02 Oct 2008 07:45:00 GMT

When you add a Literal control to Page Header, for example: <head runat="server"> <asp:Literal runat="server" ID ="literal" >Literal Test!</asp:Literal> <title>Untitled Page</title> </head> When you browser the page...(read more)

单例模式

Yonggang Meng — Sun, 03 Feb 2008 07:12:00 GMT

从今天开始，我每周会写一个关于设计模式的文章，还是用自己的语言，从自己的角度来阐述设计模式的用途，好处，以及怎么用。首先，最简单的也就是单例了，我就用他作为自己的第一篇设计模式的文章吧。 1. 单例的目的是什么？这个应该很明显，保证一个类只有单一的实例，也就是说你无法通过New或CreateInstance来创建这个类的一个新实例。 2. 单例的好处在哪里？当一个对象在程序内部只能有一个实例的时候，它可以保证我们不会重复创建，而是始终指向同一个对象。 3. 怎么用？单例模式的实现代码如下...(read more)

对IOC和DI的理解

Yonggang Meng — Mon, 28 Jan 2008 07:07:00 GMT

首先说一下什么是IOC和DI，IOC是Inversion of Control（控制反转）的简写，DI是Dependency Injection（依赖注入）的简写，martinfowler对IOC的解释为：“ Inversion of control is a common characteristic of frameworks, so saying that these lightweight containers are special because they use inversion...(read more)