using System;
using aClass = NameSpace1.MyClass;
using bClass = NameSpace2.MyClass;
 
namespace NameSpace1 
{
  public class MyClass 
  {
    public override string ToString() 
    {
      return "You are in NameSpace1.MyClass";
    }
  }
}
 
namespace NameSpace2 
{
  class MyClass 
  {
    public override string ToString() 
    {
      return "You are in NameSpace2.MyClass";
    }
  }
}
 
namespace testUsing
{
  using NameSpace1;
  using NameSpace2;
  /// <summary>
  /// Class1 的摘要說明。
  /// </summary>
  class Class1
  {
    /// <summary>
    /// 應用程序的主入口點。
    /// </summary>
    [STAThread]
    static void Main(string[] args)
    {
      //
      // TODO: 在此處添加代碼以啟動應用程序
      //
 
      aClass my1 = new aClass();
      Console.WriteLine(my1);
      bClass my2 = new bClass();
      Console.WriteLine(my2);
      Console.WriteLine("Press any key");
      Console.Read();
    }
  }
}

using (Class1 cls1 = new Class1(), cls2 = new Class1())
{
 // the code using cls1, cls2
} // call the Dispose on cls1 and cls2