Star Pyramid

Here is the logic : n is number of lines provided by user:  
  1. for (int i = 1; i <= n; i++)  
  2. {  
  3. for (int j = i; j <= 12; j++)  
  4. {  
  5. Console.Write(" ");  
  6. }  
  7. for (int k = 1; k <= 2 * i - 1; k++)  
  8. {  
  9. Console.Write("*" + " ");  
  10. }  
  11. Console.WriteLine();  
  12. }  
  13. Console.ReadLine();