How to change one line in an already compiled .exe C# file?

Question

.NET

Hello!
There is already compiled .exe C# file. It needs to change a single line.
Need instead:

{
    return (bool).......;
}

do:

{
    return true;
}

Has anyone already encountered this? Any thoughts?
Regards
Additional:
Thank you all for your replies. Unfortunately, after decompilation, the code cannot be compiled back (I'm talking about DotPeek or Reflector).
Also, it did not work out after ildasm -> ilasm.

Answer 1

The question was asked a long time ago. Got it figured out a long time ago. I'll answer in case others need it. Nothing helped except .Net Reflector and its plugin - Reflexil. Open the program with a reflector and either rewrite the entire method (if possible), or change the CIL codes.

Answer 2

msdn.microsoft.com/en-us/library/f7dy01k1(v=vs.110...
msdn.microsoft.com/en-us/library/496e4ekx(v=vs.110...

Answer 3

Decompile the code and change the line. Compile code

Answer 4

Is it necessary to change the whole method? If you really need it, you can use the Extension methods. You can try to inherit the class and override the method.