Microsoft.CSharp.CSharpCodeProvider csp = new Microsoft.CSharp.CSharpCodeProvider();

System.CodeDOM.Compiler.CompilerParameters pm = new CompilerParameters();

pm.GenerateExecutable = true;

pm.OutputAssembly = "\\out.exe";

System.CodeDOM.Compiler.CompilerResults res = csp.CompileAssemblyFromSource(pm, txt.Text);

if (res.Errors.Count > 0)

foreach (CompilerError r in res.Errors)

lst.Items.Add(r.Line + ", " + r.Column + ":" + r.ErrorNumber + " - " + r.ErrorText);

else

System.Diagnostics.Process pc = new System.Diagnostics.Process();

pc.StartInfo.FileName = "\\out.exe";

pc.Start();