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  ASP.NET PowerPack
The ASP.NET PowerPack contains 28 rich, cross-browser controls including:
 - RichTextBox
 - ComboBox
 - DatePicker
 - No-Repost validator

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     Windows Tools

ADO.NET ConnTest
A simple, free Windows program to test ADO.NET connection strings.

Lines of C#
Ever wanted to know how many lines of C# code are in a file or folder hierarchy?  This free Windows program will tell you.

XmlTools
Free tools to process XML files from the command line.

 
ASP.NET PowerPack NoRepostValidator Control

The NoRepostValidator control verifies form posts to ensure that duplicate submissions are not allowed. Any duplicate submission will be prevented by the NoRepostValidator failing all but the first validations.

As you can try out below, you can enter any value in the textbox and press ‘Test!’, and that post will succeed. But if you press F5 or click the ‘Refresh’ button, validation fails.

Some Value:  

View ASPX Source (click to expand)