C# - Is there really a need for debug build in .net

Question

If the release version produces .pdb files and you can step into every line, put breakpoints etc then why ever bother to build a "debug" version of my components?

I'm using c# for my projects and i didn't have problem debugging release versions. In C++ i had problems debugging optimized code but in C# it works fine. I'm not talking about silly code blocks like if(false)...

Answer 1

The release builds are more optimized, e.g. when I debug release builds it annoys me that local variable's values disappear when their values are not going to be used by the runtime.