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Use the BoundField.ReadOnly property to prevent the values displayed in a System.Web.UI.WebControls.BoundField object from being modified. When a data-bound control is in edit mode, fields that are read-only are displayed as plain text, without any editing controls.
The BoundField.ReadOnly property applies only to edit mode. To prevent fields from showing up in insert mode, use the DataControlField.InsertVisible property.