One91

  public static void Main(string[] args)  
     {  
       Console.Write("Enter a number: ");  
       int n = Convert.ToInt32(Console.ReadLine());  
       Console.WriteLine();  
       for (int i = 1; i < n; i++)  
       {  
         for (int j = 1; j <= i; j++)  
           Console.Write(j.ToString());  
         Console.WriteLine();  
       }  
       for (int i = n; i >= 0; i--)  
       {  
         for (int j = 1; j <= i; j++)  
           Console.Write(j.ToString());  
         Console.WriteLine();  
       }  
       Console.WriteLine();  
       Console.ReadLine();  
     }