here is some running code ...
the dll im loading is a simple  c# code file static main
Prints "hello world"
Sample of the myasm.dll at end of this file
Im new At this...so lots of learning going on here......i wanna make sure
there is no
memory leaks and i can load, execute and unload dlls at run time

all you knowledge is very welcome
thanks
Mike

Example:
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.CodeDom.Compiler;
using System.Windows.Forms;
using System.Reflection;
using Microsoft.CSharp;
using System.Threading;

namespace Compiler1
{
   class Program
   {
       static void Main(string[] args)
       {
           CompileAndRun.Compile();
           CompileAndRun.RunRemote();

       }
   }
   public static class CompileAndRun
   {
       public static void Run()
       {

           CompilerResults Result = CompileAndRun.Compile();
           //Execute the class

           Console.WriteLine(Result.CompiledAssembly.Location);
           Console.WriteLine(Result.CompiledAssembly.FullName);

           //  Assembly MyAsm =
NewDomainName.Load(Result.CompiledAssembly.Location); //"myasm.dll");
//Result.CompiledAssembly.Location);
             Assembly MyAsm = Result.CompiledAssembly;

           if (MyAsm == null)
           {
               Console.WriteLine("dll not loaded");
           }

           object myobj = MyAsm.CreateInstance("mynamespace.MyClass");

           if (myobj == null)
           {
               MessageBox.Show("Couldn't load class.");
               return;
           }
           object ret = myobj.GetType().InvokeMember("Test",
                BindingFlags.InvokeMethod, null, myobj, null);

           Console.WriteLine("back");

           System.Threading.Thread.Sleep(10000);

       }
       public static CompilerResults Compile()
       {
           CodeDomProvider Provider =
CodeDomProvider.CreateProvider("CSharp");
           CompilerParameters cp = new CompilerParameters();
           cp.ReferencedAssemblies.Add("System.DLL");
           //cp.ReferencedAssemblies.Add("System.IO.dll");
           cp.ReferencedAssemblies.Add("System.Windows.Forms.dll");
           cp.GenerateInMemory = false;
           cp.OutputAssembly = "d:\\cstest\\myasm.dll";
           CompilerResults Result = Provider.CompileAssemblyFromFile(cp,
"d:\\cstest\\class1.cs");
           Console.WriteLine(Result.Errors.Count);
           if (Result.Errors.HasErrors)
           {
               string eMsg = "";
               eMsg = Result.Errors.Count.ToString() + " Errors ";
               for (int x = 0; x < Result.Errors.Count; x++)
               {
                   eMsg = eMsg + "\r\n " +
                   Result.Errors[x].Line.ToString() + " - " +
                   Result.Errors[x].ErrorText;
               }
               MessageBox.Show(eMsg);
           }
           return Result;
       }
       public static void printall(AppDomain ad)
       {
           Assembly[] LoadedAssemblies =ad.GetAssemblies();
           foreach( Assembly a in LoadedAssemblies)
           {
               Console.WriteLine(a.GetName().Name);
           }
           Console.ReadKey();
       }
       public static void RunRemote()
       {
           //CSScriptLibrary.CSScript.Load("d:\\cstest\\class1.cs");
           for (int x = 0; x < 1000; x++)
           {

               AppDomain ad = AppDomain.CreateDomain("NewDomain");

               // Assembly as
               Assembly MyAsm = ad.Load("myasm");
               object myobj = MyAsm.CreateInstance("mynamespace.MyClass");
               object ret = myobj.GetType().InvokeMember("Main",
                  BindingFlags.InvokeMethod, null, myobj, null);
               AppDomain.Unload(ad);

               Thread.Sleep(1000);

           }
       }
   }
}

// Sample class1.cs using to compile and load in new appdomain

using System;
using System.IO;
using System.Windows.Forms;
namespace mynamespace
{
public class MyClass:MarshalByRefObject
{
   public static void Main()
   {

      Console.WriteLine("Hello World # 9million 38");
       //MessageBox.Show("hello World");
   }
}
}

im also having problems loading a dll from a Different path, other then the
Application Path....
Thanks again for all you help it is really appriciated
Mike