Sys.WebForms.PageRequestManagerServerErrorException:

Problem: - Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500

Solution: -

In the @Page tag set 

ValidateRequest="false"

When does it occur?

This normally occurs when there is 

1) a multiline textbox in the page

2) an update panel in the page inside which the multiline textbox resides

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Dictionary Objects Sites

http://dotnetref.blogspot.com/2007/12/iterating-through-dictionary-objects.html

http://www.kirupa.com/net/dictionary_hashtable2.htm

http://en.csharp-online.net/CSharp_Generics_Recipes—Using_foreach_with_Generic_Dictionary_Types

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XML Learning

http://www.functionx.com/csharp/xml/Lesson02.htm

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File-download-using-CSharp

http://www.aspfree.com/c/a/Code-Examples/File-download-using-C/

http://www.csharpfriends.com/Articles/getArticle.aspx?articleID=115

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System.IO.FileStream Class - A good tutorial

System.IO.FileStream Class

A good tutorial on FileStream in C#

http://www.gnu.org/software/dotgnu/pnetlib-doc/System/IO/FileStream.html

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