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this.gridDataBoundGrid1.Binder.InternalColumns["Fax"].HeaderText = "Special Fax";
This code assumes you did not explicilty add GridBoundColumns to the grid. If you did, then you would use
this.gridDataBoundGrid1.GridBoundColumns["Fax"].HeaderText = "Special Fax";
instead.
this.gridDataBoundGrid1[0,0].Text = "Hello";