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