Using the new keyword in lieu of the override keyword in C# will allow for method hiding not unlike just leaving the override keyword off.

namespace Whatever.Objects
{
   public class Cat
   {
       public virtual string Speak()
       {
           return "Meow";
       }
   }
}

 
 

Considering the class above, note these three scenarios for a child class named Lion. In each scenario the test provided passes.

Child	Test
namespace Whatever.Objects   {      public class Lion : Cat      {          public override string Speak()          {              return "Roar";          }      }   }	using Microsoft.VisualStudio.TestTools.UnitTesting;   using Whatever.Objects;   namespace Whatever.Tests   {      [TestClass]      public class Test      {          [TestMethod]          public void Lion_says_what_youd_expect()          {              Lion lion = new Lion();              Cat cat = lion;              Assert.AreEqual(cat.Speak(), "Roar");          }      }   }
namespace Whatever.Objects   {      public class Lion : Cat      {          public string Speak()          {              return "Roar";          }      }   }	using Microsoft.VisualStudio.TestTools.UnitTesting;   using Whatever.Objects;   namespace Whatever.Tests   {      [TestClass]      public class Test      {          [TestMethod]          public void Lion_says_what_youd_expect()          {              Lion lion = new Lion();              Cat cat = lion;              Assert.AreEqual(cat.Speak(), "Meow");          }      }   }
namespace Whatever.Objects   {      public class Lion : Cat      {          public new string Speak()          {              return "Roar";          }      }   }	using Microsoft.VisualStudio.TestTools.UnitTesting;   using Whatever.Objects;   namespace Whatever.Tests   {      [TestClass]      public class Test      {          [TestMethod]          public void Lion_says_what_youd_expect()          {              Lion lion = new Lion();              Cat cat = lion;              Assert.AreEqual(cat.Speak(), "Meow");          }      }   }