Compiler Error CS0017

Program 'output file name' has more than one entry point defined. Compile with /main to specify the type that contains the entry point.

A program can only have one Main method.

To resolve this error, you can either delete all Main methods in your code, except one, or you can use the StartupObject compiler option to specify which Main method you want to use.

The following sample generates CS0017:

// CS0017.cs  
// compile with: /target:exe  
public class clx  
{  
   static public void Main()  
   {  
   }  
}  
  
public class cly  
{  
   public static void Main()   // CS0017, delete one Main or use /main  
   {  
   }  
}