c# - using string format for a credit card number -

I try to display a credit card number such as #### ######## String I am doing ####

I tried:

  txtbox.Text = string.Format ("{0: #### ###### ######} ", ccNumber);    And it was not working any thoughts?   
 
   string format ("{0000 0000 0000 0000}", number)   Edit    I paste my comment here to paste:  
 ccNumber an int or wire? If it is an integer, then it should work if it is a string, then you must  
  string format ("{0000 0000 0000}", (Int64.Parse ("123456781245645678" )))    

 


  







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