Program.cs
 

using System;

namespace MyApplication
{
  class Program
  {
    static void Main(string[] args)
    {
      double myDouble = 9.78;
      int myInt = (int) myDouble;  // Manual casting: double to int

      Console.WriteLine(myDouble);
      Console.WriteLine(myInt);
    }
  }
}

Result:
9.78
9