CSharpCompile

public static CompilerResults CSharpCompile(this string code, string dllName = "dynamicCompile", params string[] additionalAssemblies)
{
 var csc = new CSharpCodeProvider(new Dictionary<string, string>() { { "CompilerVersion", "v4.0" } });
 var parameters = new CompilerParameters
 {
 ReferencedAssemblies = {
 "mscorlib.dll",
 "System.Core.dll",
 },
 OutputAssembly = dllName,
 GenerateExecutable = false,
 GenerateInMemory = true,
 };

 parameters.ReferencedAssemblies.AddRange(additionalAssemblies);

 return csc.CompileAssemblyFromSource(parameters, code);
}

var results = @"include System;

public class Example1
{
 public string Prop { get; set; }
}".CSharpCompile();