Gets the value of the key field at index 0 in the System.Web.UI.WebControls.DataKey object.
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Instead of using the DataKey.Item(int) or the DataKey.Values property to retrieve a key field value from a System.Web.UI.WebControls.DataKey object, you can use the DataKey.Value property as a shortcut to determine the value of the key field at index 0 in the System.Web.UI.WebControls.DataKey object. This property is commonly used to determine the key field value of a record when the record has only one key field.
If the System.Web.UI.WebControls.DataKey object does not contain any key fields, null is returned.