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CompilerParameters cp = new CompilerParameters();
cp.GenerateExecutable = true;
cp.OutputAssembly = "Result.exe";
cp.GenerateInMemory = false;
CompilerResults cr = provider.CompileAssemblyFromSource(cp, sourcecode);                    

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CompilerParameters cp = new CompilerParameters();
cp.GenerateExecutable = false;
//cp.OutputAssembly = "Result.exe";
cp.GenerateInMemory = true;
CompilerResults cr = provider.CompileAssemblyFromSource(cp, sourcecode);                    

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CompilerResults.CompiledAssembly
CreateInstance
GetMethod
Invoke
...                    

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var instanceOfSomeClass = compilerResults.CompiledAssembly.CreateInstance(className);

instanceOfSomeClass.GetType().GetMethod("DoSomething").Invoke(instanceOfSomeClass, null);                    

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String sourcecode = "\nusing System;\npublic class Sample \n{\n    static void Main()\n    {\n        Console.WriteLine(\"This is a test\");\n    }\n}"                    

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public void CSharpCodeExample()
    {

        String sourcecode = "\nusing System;\npublic class Sample \n{\n    static void Main()\n    {\n        Console.WriteLine(\"This is a test\");\n    }\n}";
        //String sourcecode = "using System;public class Sample{static void Main(){Console.WriteLine(\"This is a test 2\");Console.ReadLine();}}";
    

        CSharpCodeProvider provider = new CSharpCodeProvider();

        CompilerParameters cp = new CompilerParameters();

        cp.GenerateExecutable = false;

        //cp.OutputAssembly = "Result.exe";

        cp.GenerateInMemory = true;

        CompilerResults cr = provider.CompileAssemblyFromSource(cp, sourcecode);

        if (cr.Errors.Count > 0)
        {

            Console.WriteLine("Errors building {0} into {1}", sourcecode, cr.PathToAssembly);

            foreach (CompilerError ce in cr.Errors)
            {

                Console.WriteLine("  {0}", ce.ToString());

                Console.WriteLine(); 

            }

        }

        else
        {

            Console.WriteLine("Source \n \n {0} \n \n \n built into {1} successfully.", sourcecode, cr.PathToAssembly);

            var instanceOfSomeClass = cr.CompiledAssembly.CreateInstance("Sample");
            instanceOfSomeClass.GetType().GetMethod("Main").Invoke(instanceOfSomeClass, null);
        }

        return;

    }                    

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cr.CompiledAssembly.GetType("Sample").GetMethod("DoSomething", BindingFlags.Public | BindingFlags.Static).Invoke(null, null);                    

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MethodInfo methodInfo = instanceOfSomeClass.GetType().GetMethod("Main");
if (methodInfo != null)
  methodInfo.Invoke(instanceOfSomeClass, null);                    

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BindingFlags flags = BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic;
MethodInfo methodInfo = instanceOfSomeClass.GetType().GetMethod("Main", BindingFlags);