/pdb (Specify Debug Symbol File) (C# Compiler Options)
The /pdb compiler option specifies the name and location of the debug symbols file.
When you specify, the compiler will create a .pdb file in the same directory where the compiler will create the output file (.exe or .dll) with a file name that is the same as the name of the output file.
/pdb allows you to specify a non-default file name and location for the .pdb file.
This compiler option cannot be set in the Visual Studio development environment, nor can it be changed programmatically.