Bagaimana untuk mengesahkan pengecualian yang dilemparkan dalam ujian unit C#?

using System;
namespace DemoApplication {
   public class Program {
      static void Main(string[] args) {
      }
      public string StringAppend(string firstName, string lastName) {
         throw new Exception("Test Exception");
      }
   }
}

using System;
using DemoApplication;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace DemoUnitTest {
   [TestClass]
   public class DemoUnitTest {
      [TestMethod]
      public void DemoMethod() {
         Program program = new Program();
         var ex = Assert.ThrowsException<Exception>(() => program.StringAppend("Michael","Jackson"));
         Assert.AreSame(ex.Message, "Test Exception");
      }
   }
}

using System;
using DemoApplication;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace DemoUnitTest {
   [TestClass]
   public class DemoUnitTest {
      [TestMethod]
      [ExpectedException(typeof(Exception), "Test Exception")]
      public void DemoMethod() {
         Program program = new Program();
         program.StringAppend("Michael", "Jackson");
      }
   }
}