Question

I need to make the primary .exe unrunnable from it (When you try to start it directly ,you get a message : Cannot start directly,if it runs from the secondary exe (only it,must have a crc verification i think) then start .

Hope i make myself clear
First .exe can’t start directly
Second .exe can start the first exe (only)

Answer 1

Set up the EXE that can’t be started directly to accept a parameter, such as a SHA-256 hash of some unique data from the one that’s supposed to start it. If that parameter doesn’t exist or is not what’s expected, display an error and exit.

EDIT:

static class Program
{
   static void Main(params string[] args) //<- first needed change
   {
       if(args.Length == 0 || args[0] != "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
       {
          Console.WriteLine("Cannot execute this program directly.")
          return;
       }

       ... //rest of main function
   }
}