Override Sealed is valid but why not Virtual Sealed in C#?

The below code snippet is valid

public class BaseClass
{

   public virtual void Display()
   {
      Console.WriteLine("Virtual method");
   }
 }

public class DerivedClass : BaseClass
{

  public override sealed void Display()
  {
       Console.WriteLine("Sealed method");
  }

}

But why not

public class BaseClass
{

 public virtual sealed void Display()
 {
          Console.WriteLine("Virtual method");
 }
}

Edited

Actually I was reading What is sealed class and sealed method? this article. So I was following the author's instruction. Suddenly I tried to play the concept of Sealed with the base class. That's why I came up with this question.