Gets or sets a value indicating whether the values of the field specified by the ImageField.DataImageUrlField property can be modified in edit mode.
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By default, the values of the field specified by the ImageField.DataImageUrlField property can be modified by the user when a data-bound control is in edit mode. To prevent the user from changing the values of the field, set this property to true.
In an System.Web.UI.WebControls.ImageField object, the ImageField.DataImageUrlField property usually contains the name of the field that contains the URLs to the images displayed in the object.