-codepage (C# Compiler Options)
This option specifies which codepage to use during compilation if the required page is not the current default codepage for the system.
The id of the code page to use for all source code files in the compilation.
The compiler will first attempt to interpret all source files as UTF-8. If your source code files are in an encoding other than UTF-8 and use characters other than 7-bit ASCII characters, use the -codepage option to specify which code page should be used. -codepage applies to all source code files in your compilation.
See GetCPInfo for information on how to find which code pages are supported on your system.
This compiler option is unavailable in Visual Studio and cannot be changed programmatically.