C#

How to read XML from a file by using Visual C# 2005 or Visual C# .NET
http://support.microsoft.com/kb/307548#4

Online C# Books
http://www.publicjoe.co.uk/csharp/samples/ebook.html

Comparing Java and .NET
http://www.informit.com/guides/content.asp?g=dotnet&seqNum=102&rl=1

Reading and Writing XML Documents using C#.Net
http://www.c-sharpcorner.com/Tutorials/ReadWriteXMLTutMellli21.asp

Using C# .NET in Excel 2003
http://www.c-sharpcorner.com/Code/2003/May/Excel2003fromCSharp.asp

Total .NET SourceBook Trial
http://www.fmsinc.com/dotnet/sourcebook/conftrial.asp

101 Visual Basic and C# Code Samples
http://www.microsoft.com/downloads/details.aspx?FamilyId=08E3D5F8-033D-420B-A3B1-3074505C03F3&displaylang=en

Introduction to Visual Studio .NET
http://msdn2.microsoft.com/en-us/library/ms973867.aspx

Walkthrough: Creating Custom Menu Items in Excel
http://msdn2.microsoft.com/en-us/library/aa168343(office.11).aspx

Convert a Text File to XML
http://www.devx.com/getHelpOn/10MinuteSolution/20356

Measuring Execution Time in C#
http://www.codersource.net/csharp_measure_execution_time.aspx

Regular Expressions Usage in C#
The code Functions written for Validation Alphabet, AlphaNumeric, Integer, Postive Integer, Floating point numbers.
http://www.c-sharpcorner.com/UploadFile/prasad_1/RegExpPSD12062005021717AM/RegExpPSD.aspx

Write code in your favourite language and convert to any .NET language you want !
http://www.dotnetspider.com/convert/

Mapping Microsoft Excel columns with XML data (XML data integration) programmatically using a .Net Application
http://www.c-sharpcorner.com/UploadFile/saj/XMLDataIntegration04212005214701PM/XMLDataIntegration.aspx?ArticleID=6f784d71-7845-48c5-83b9-d0b7d17f7073

How to transfer XML data to Microsoft Excel 2002 or Microsoft Excel 2003 by using Visual C#
http://support.microsoft.com/kb/307029