Вот источник:

using System.Reflection;

using System.CodeDom.Compiler;

using Microsoft.CSharp;      // and/or Microsoft.VisualBasic;

…

private void button1_Click(object sender, System.EventArgs e)

{

   // *** Example form input has code in a text box

   string lcCode = this.txtCode.Text;

 

   ICodeCompiler loCompiler = new CSharpCodeProvider().CreateCompiler();

   CompilerParameters loParameters = new CompilerParameters();

 

   // *** Start by adding any referenced assemblies

   loParameters.ReferencedAssemblies.Add("System.dll");

   loParameters.ReferencedAssemblies.Add("System.Windows.Forms.dll");

 

   // *** Must create a fully functional assembly as a string

   lcCode = @"using System;

using System.IO;

using System.Windows.Forms;

 

namespace MyNamespace {

public class MyClass {

 

public object DynamicCode(params object[] Parameters) {

"  + lcCode +

"}   }    }";

 

   // *** Load the resulting assembly into memory

   loParameters.GenerateInMemory = false;

  

   // *** Now compile the whole thing

   CompilerResults loCompiled =

           loCompiler.CompileAssemblyFromSource(loParameters,lcCode);

 

   if (loCompiled.Errors.HasErrors)    {

      string lcErrorMsg = "";

 

      lcErrorMsg = loCompiled.Errors.Count.ToString() + " Errors:";

      for (int x=0;x<loCompiled.Errors.Count;x++)

         lcErrorMsg = lcErrorMsg  + "\rLine: " +

                      loCompiled.Errors[x].Line.ToString() + " - " +                          

                      loCompiled.Errors[x].ErrorText;     

 

      MessageBox.Show(lcErrorMsg + "\r\r" + lcCode,

                      "Compiler Demo");

      return;

   }

 

   Assembly loAssembly = loCompiled.CompiledAssembly;

 

   // *** Retrieve an obj ref – generic type only

   object loObject  = loAssembly.CreateInstance("MyNamespace.MyClass");

   if (loObject == null) {

      MessageBox.Show("Couldn't load class.");

      return;

   }

 

   object[] loCodeParms = new object[1];

   loCodeParms[0] = "West Wind Technologies";

  

   try    {

      object loResult = loObject.GetType().InvokeMember(

                       "DynamicCode",BindingFlags.InvokeMethod,

                       null,loObject,loCodeParms);

 

      DateTime ltNow = (DateTime) loResult;

      MessageBox.Show("Method Call Result:\r\r" +

                      loResult.ToString(),"Compiler Demo");

   }

   catch(Exception loError)    {

      MessageBox.Show(loError.Message,"Compiler Demo"); }

}