Gets or sets the URL to an image to display for the Cancel button in a System.Web.UI.WebControls.CommandField field.
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When the ButtonFieldBase.ButtonType property of a System.Web.UI.WebControls.CommandField field is set to ButtonType.Image, use the CommandField.CancelImageUrl property to specify the image to display for the Cancel button. This image can be in any file format (.jpg, .gif, .bmp, and so on), as long as the client's browser supports that format.
As an alternative to displaying an image for the Cancel button, you can display text by first setting the ButtonFieldBase.ButtonType property to ButtonType.Button or ButtonType.Link and then setting the CommandField.CancelText property.