‘Sys’ is undefined – ASP.Net Ajax error

I was using ASP.NET 2.0 along with Ajax Extensions 1.0. I received this error ‘Sys’ is undefined error message every time I used an Ajax control. I was pulling my hair out on it and decided to give the Control Toolkit’s web.config a glance. The following lines were not available in my web.config, so i [...]

Hide a window instead of closing it in WPF

I wanted to give WPF a try and was creating a timer application which will pop up a window once a while. But what I wanted was for the application to keep running in the tray even when its closed. The following code does NOT work in WPF for some reason:
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs [...]

Using StreamReader without locking the file in C#

I was using the StreamReader class to read the contents of a text file. I was under the assumption (well I know its a bad
thing)  that because I am only reading the contents of the file, the file would be available for other applications to read or write. Guess what, i was wrong. The StreamReader [...]

Computed Columns in SQL Server 2005

Using Persited Columns in SQL Server 2005 via t-sql and sql server management studio

Strip Illegal XML Characters based on W3C standard

W3C has defined a set of illegal characters for use in XML . You can find info about the same here:
XML 1.0 | XML 1.1
Here is a function to remove these characters from a specified XML file:
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;

namespace XMLUtils
{
class Standards
{
[...]

Quickly calculate and compare MD5 or SHA2 values

There might be situations when you might want to quickly calculate the MD5 or SHA2  values of any file or a set of files. The solution depends on what is your requirement: 1) Its a one time work and you would just want the results in a text / html file 2) You want the [...]

LIFO and FIFO (Stack and Queue)

Well, I was working on one of the projects which required the use of the FIFO and LIFO data structures. Since the project was based on .NET, I had no trouble at all implementing the same.
The System.Collections namespace provides us with the classes required to implement FIFO and LIFO.
Declare the queue:
Queue myQ = new Queue(5);
To [...]