REFERENCE LINK

C# 

http://www.c-sharpcorner.com
http://www.codeproject.com
http://www.developerfusion.com/tools/convert/vb-to-csharp/
http://www.csharp-station.com/Tutorial.aspx

CSS LINK:

http://www.csstemplatesfree.org
http://www.templatemo.com
http://www.sheir.org
http://www.w3schools.com/

Ajax/ASP:

https://skydrive.live.com
http://asp-net-example.blogspot.in
http://www.w3schools.com/

PHP:
http://www.9lessons.info

C/C++ Interview Questions:

http://www.softcorp.demon.co.uk/c++2.htm
http://www.onesmartclick.com/interviews/interviews-programming.html
http://www.cpuniverse.com/newsite/archives/1999/mar/c++.html
http://www.oneparticularharbor.net/sam/interview.htmlhttp://www.acetheinterview.com/cgi-bin/qanda.cgi?action=topics&number=5http://www.geocities.com/Athens/Agora/3027/work/interviewQuestions.html
http://www.moskalyuk.com/jobs/cpp_5.htm
http://www.moskalyuk.com/jobs/java_1.htm
http://www.cs.unc.edu/~scheib/work/questions/
http://www.cis.temple.edu/~ingargio/cis307/assessment/interviews.html
http://www.geocities.com/SiliconValley/Park/1512/cpuz_l1.html

C/C++ Notes for Interviews:

http://leepoint.net/notes/cpp/
http://www.parashift.com/c++-faq-lite/
http://cslibrary.stanford.edu/

Microsoft Interview Questions:

http://halcyon.usc.edu/~kiran/msqs.html
http://www.4guysfromrolla.com/ASPscripts/PrintPage.asp?REF=/webtech/012700-1.shtml
http://www.sellsbrothers.com/fun/msiview/default.aspx?content=question.htm
http://www.acetheinterview.com/qanda/microsoft_interview.html
http://bbs.mit.edu/cgi-bin/BBS0an?/groups/GROUP_3/JobHunting/Interview
http://www.bucketobits.com/chris/programmerinterviewquestions.html

Puzzles:

http://www.techinterview.org/archive/
http://puzzle.dse.nl/index_us.html
http://www.chlond.demon.co.uk/academic/puzzles.html
http://pub13.ezboard.com/fvisualbasicexplorerfrm44

Operating Systems Notes:

http://williamstallings.com/Extras/OS-Notes/notes.html
http://www.ibilce.unesp.br/courseware/opsys/ostart.htm
http://www.cs.wisc.edu/~solomon/cs537/notes.html
http://www.cs.wisc.edu/~bart/537/lecturenotes/titlepage.html

Win32 Tutorials:

http://www.winprog.org/tutorial/
http://www.gajits.com/win32.asp

Data Structure Notes:

http://ciips.ee.uwa.edu.au/~morris/Year2/PLDS210/ds_ToC.html
http://www.csl.mtu.edu/cs2321.rp/www/lectures/cs2321lectures.htm

Software Testing Notes:

http://louisa.levels.unisa.edu.au/se1/testing-notes/testing.htm
http://hebb.cis.uoguelph.ca/~dave/343/Lectures/testing.html
http://www.cee.hw.ac.uk/~air/se4/
http://www.darkshire.org/~jhkim/programming/process/testing.html

Mathematical Puzzles

http://thinks.com/webguide/mathpuzzles.htm
http://www.syvum.com/teasers/
http://www.eduplace.com/math/brain/
http://www.brainbashers.com/
http://barryispuzzled.com/
http://www.braingle.com/