ASP.NET GridView Column - formatting telephone number -

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I am adding a column in the code-back to my gridview as follows: 

 < Code> field = new boundfield (); Field.HeaderText = "Phone Number"; Field.DataField = "phone number"; Field.HtmlEncode = false; Field.DataFormatString = "{0: ### - ### - ####}"; GridView.Columns.Add (area); However, DataFormatString is not working because the PhoneNumber field is a string, not a numerical DataFormatString in order to keep in mind what is there anyway, or before I get this point Need to change data type before reaching?

It's difficult to format 'manually' in the grid's robotabout event.


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