How to replace "\" with "\\"
i am using str.replace("\","\\") but its not working

The character '\' is used as an escape character.
So when you include it in a string the next char is the one that is considered what you are after.
So str.replace("\","\\") means if you find 'nothing/empty string' replace it with one '\'.
You need something like the following
str.replace("\\","\\\\")
or
str.replace(@"\",@"\\")
I think the second is the better approach

======================================
They say, best men are molded out of faults,
And, for the most, become much more the better
For being a little bad.
======================================

your may use.
str=str.Replace("\","\\");
because str.Replace only makes virtual changes.
not stored to your str variable.Ok
I Think This one help you.

Thanks and Regards
Kumar Ashish
9350789189

thank you
now my problem get solved by your solution
tnaks a lot