C# program to calculates factorial

• C# program to calculates N!/K! for given N and K  (1<K<N)

     static void Main()  
     {  
       Console.WriteLine("Enter number: ");  
       int n = int.Parse(Console.ReadLine());  
       int k = int.Parse(Console.ReadLine());  
       Int64 Nfac = 1;  
       Int64 Kfac = 1;  
       Int64 result;  
       for (int i = 1; i <= n; i++)  
       {  
         Nfac = Nfac * i;  
       }  
       for (int i = 1; i <= k; i++)  
       {  
         Kfac = Kfac * i;  
       }  
       result = Nfac / Kfac;  
       Console.WriteLine(result);  
       Console.ReadLine();  
     }