two different language file

Question

hi this is kavita

I m facing a problem.My project is in vb.net. and a class file 'callfunction.vb' it is in app_code and one more file I want to put in app_code 'history',it is in c#. and give me this error

The files '/.../App_Code/history.cs' and '/.../App_Code/call_function.vb' use a different language, which is not allowed since they need to be compiled together.    /

any suggestion?