C# code showing error "A namespace cannot directly contain members such as fields or methods"

Question

I don't know why this error pops up I don't have anything declared out of class my full code is this:

using System;
using Microsoft.CSharp;
using System.IO;
using System.CodeDom.Compiler;
using System.Text;

namespace test
  {
  public class comp
   {
    static void Main()
    {
        string code="0x4d,0x41,0x2......"; //and soo onnn
        string Arch = " /platform:x86 /optimize";
        string filePath = "C:/menmon.exe";
        CSharpCodeProvider provider = new CSharpCodeProvider();
        CompilerParameters parameters = new CompilerParameters();

        parameters.ReferencedAssemblies.Add("System.Core.dll");
        parameters.GenerateInMemory = false;
        parameters.GenerateExecutable = true;
        parameters.IncludeDebugInformation = false;
        parameters.ReferencedAssemblies.Add("mscorlib.dll");
        parameters.ReferencedAssemblies.Add("System.dll");

        parameters.OutputAssembly = filePath;
        parameters.CompilerOptions = "/target:exe" + Arch;
        CompilerResults results = provider.CompileAssemblyFromSource(parameters, code);
        if (results.Errors.HasErrors)
        {
        StringBuilder sb = new StringBuilder();
        foreach (CompilerError error in results.Errors)
          {
            sb.AppendLine(String.Format("Error ({0}): {1}", error.ErrorNumber, error.ErrorText));
          }
        }

        throw new InvalidOperationException(sb.ToString());
      }
    }
  } 

}

Compiled this using cmd on Windows machine on .Net framework64 v4.0.30319 error happens after compilation(on compilation no error is shown) when I run the program this error pops up:

Unhandled Exception: System.InvalidOperationException: Error (CS0116): A namespace cannot directly contain members such as fields or methods

at comp.Main()

I ran csc.exe like this

csc /t:exe /out:"C:\\output.exe" "C:\\input.cs"

Answer 1

Not sure will this help you but can you please try to add namespace of your App just up of the class so it looks like this:

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }
    }
}

Also you are missing semi colon on the last line in main function.