Gets or sets the object to be set as the control property when the data source contains a DBNull value.
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The data source must contain DBNull for the Binding.NullValue property to be correctly applied. If the data source type is a type such as a string or integer the value of the Binding.NullValue property will be ignored. Also, the Binding.NullValue property is ignored if it is set to null.
A null value will be added to the data source when the control property is set to the object of Binding.NullValue. If Binding.NullValue is set to a string value, comparisons are case-insensitive.