help for create exe on run time

private void btnCompile_Click(object sender, System.EventArgs e)
		{
			CSharpCodeProvider csp = new CSharpCodeProvider();
			ICodeCompiler cc = csp.CreateCompiler();
			CompilerParameters cp = new CompilerParameters();

			cp.OutputAssembly = Application.StartupPath + "\\TestClass.dll";
			cp.ReferencedAssemblies.Add("System.dll");
			cp.ReferencedAssemblies.Add("System.dll");
			cp.ReferencedAssemblies.Add("System.Data.dll");
			cp.ReferencedAssemblies.Add("System.Xml.dll");
			cp.ReferencedAssemblies.Add("mscorlib.dll");
			cp.ReferencedAssemblies.Add("System.Windows.Forms.dll");
			cp.ReferencedAssemblies.Add("CSharpScripter.exe");
					
			cp.WarningLevel = 3;

			cp.CompilerOptions = "/target:library /optimize";
			cp.GenerateExecutable = false;
			cp.GenerateInMemory = false;

			System.CodeDom.Compiler.TempFileCollection tfc = new TempFileCollection(Application.StartupPath, false);
			CompilerResults cr  = new CompilerResults(tfc);

			cr = cc.CompileAssemblyFromSource(cp, this.rtfCode.Text);

			if (cr.Errors.Count > 0) 
			{
				foreach (CompilerError ce in cr.Errors) 
				{
					Console.WriteLine(ce.ErrorNumber + ": " + ce.ErrorText);
				}
				MessageBox.Show(this, "Errors occoured", "Errors", MessageBoxButtons.OK, MessageBoxIcon.Error);
				this.btnExecute.Enabled = false;
			} 
			else 
			{
				this.btnExecute.Enabled = true;
			}
			
			System.Collections.Specialized.StringCollection sc = cr.Output;
			foreach (string s in sc) 
			{
				Console.WriteLine(s);
			}
		}