Quote:Can any one help me to find my mistake
Quote:Actually code is bit confidential as it belongs to my research work.
We cannot help you fix a problem with your code if we cannot see the code you have written: that would be like you asking the garage to fix your car engine, but not letting them know what make, model, or year it is, and refusing to bring it to the garage!
So, it's going to be up to you.
Fortunately, you have a tool available to you which will help you find out what is going on: the debugger. If you don't know how to use it then a quick Google for "Visual Studio debugger" should give you the info you need.
Put a breakpoint on the first line in the function, and run your code through the debugger. Then look at your code, and at your data and work out what should happen manually. Then single step each line checking that what you expected to happen is exactly what did. When it isn't, that's when you have a problem, and you can back-track (or run it again and look more closely) to find out why.
Sorry, but we can't do that for you - time for you to learn a new (and very, very useful) skill: debugging!