Compile C# via Code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

#region Additional needed Namespaces
using System.CodeDom;
using System.CodeDom.Compiler;
using Microsoft.CSharp;
#endregion

namespace CompileViaCode
{
    public partial class Form1 : Form
    {
        string path = "", code = "", nl = Environment.NewLine;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            tbSave.Text = "";
            tbCode.Text = "using System;" + nl +
                        "namespace Test" + nl +
                        "{" + nl +
                        "\tclass Prog" + nl +
                        "\t{" + nl +
                        "\t\tstatic void Main()" + nl +
                        "\t\t{" + nl +
                        "\t\t\tConsole.WriteLine(\"Hello World\");" + nl +
                        "\t\t\tConsole.ReadLine();" + nl +
                        "\t\t}" + nl +
                        "\t}" + nl +
                        "}";
        }

        private void tbSave_TextChanged(object sender, EventArgs e)
        {
            if (!tbSave.Text.EndsWith(".exe"))
                path = string.Format(Application.StartupPath + @"\Data\{0}.exe", tbSave.Text);
            else
                path = string.Format(Application.StartupPath + @"\Data\{0}", tbSave.Text);

            if (!string.IsNullOrEmpty(tbSave.Text))
                btnCompile.Enabled = true;
            else
                btnCompile.Enabled = false;
        }

        private void tbCode_TextChanged(object sender, EventArgs e)
        {
            code = tbCode.Text;
        }

        private void btnCompile_Click(object sender, EventArgs e)
        {
            #region For VS 2005:
            CSharpCodeProvider cp = new CSharpCodeProvider();
            ICodeCompiler icc = cp.CreateCompiler();
            #endregion

            #region VS 2008 or higher
            CodeDomProvider codeProvider = CodeDomProvider.CreateProvider("CSharp");
            #endregion
            string sv = path;

            CompilerParameters param = new CompilerParameters();
            param.GenerateExecutable = true;
            param.OutputAssembly = sv;

            #region For VS 2005:
            CompilerResults cr = icc.CompileAssemblyFromSource(param, code);
            #endregion

            #region VS 2008 or higher
            CompilerResults res = codeProvider.CompileAssemblyFromSource(param, code);
            #endregion

            string err = "";
            if (cr.Errors.Count > 0)
            {
                foreach (CompilerError er in cr.Errors)
                    err += "Line: " + er.Line + nl +
                        "Error Nr: " + er.ErrorNumber + nl +
                        "Msg: " + er.ErrorText + nl + nl;
                MessageBox.Show(err, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            else
            {
                err += "Build Successful." + nl + "You like to start?";
                if (MessageBox.Show(err, "Success", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                    System.Diagnostics.Process.Start(path);
            }
        }
    }
}