Troubleshooting “program does not contain a static 'Main' method” when it clearly does…?

Question

My MS Visual C# program was compiling and running just fine. I close MS Visual C# to go off and do other things in life.

I reopen it and (before doing anything else)

Answer 1

I had this problem and its because I wasnt using the latest version of C# (C# 7.3 as of writing this) and I had to change the below internal access modifier to public.

internal class Program
 {
    public static void Main(string[] args)
    {
        //My Code
    }
  }

or ammend the .csproj to use the latest version of C# (this way meant I could still keep the above class as internal):

    latest
    true