Gets or sets the URL to an image to display for a Delete 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.DeleteImageUrl property to specify the image to display for a Delete 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 a Delete button, you can display text by first setting the ButtonFieldBase.ButtonType property to ButtonType.Button or ButtonType.Link and then setting the CommandField.DeleteText property.