Gets or sets a value indicating whether formatting is applied to the ListControl.DisplayMember property of the System.Windows.Forms.ListControl.
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Setting the ListControl.FormattingEnabled property to true causes the ListControl.Format event to be raised for each visible member of the System.Windows.Forms.ListControl.
ComboBox.SelectedIndex, ListControl.SelectedValue, and ListControl.FormattingEnabled are related as follows:
If ListControl.FormattingEnabled is false, ComboBox.SelectedIndex will not be set to -1 when ListControl.SelectedValue is blank.
If ListControl.FormattingEnabled is true, ComboBox.SelectedIndex will be set to -1 when ListControl.SelectedValue is blank.