Gets or sets the text to display in an System.Web.UI.WebControls.ImageField object when the value of the field specified by the ImageField.DataImageUrlField property is null.
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When the value of the field specified by the ImageField.DataImageUrlField property is null, an image cannot be displayed in an System.Web.UI.WebControls.ImageField object. Use the ImageField.NullDisplayText property to specify the text to display in the image's place. The text usually indicates that the normal image is not available or cannot be found.
As an alternative, you can display an alternate image when the field value is null by setting the ImageField.NullImageUrl property instead of this property. If the ImageField.NullImageUrl and ImageField.NullDisplayText properties are both set, the ImageField.NullImageUrl property has precedence.
The value of this property, when set, can be saved automatically to a resource file by using a designer tool. For more information, see System.ComponentModel.LocalizableAttribute and ASP.NET Globalization and Localization.