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When this property is set to true, the control automatically resizes to ensure that an item is not partially displayed. If you want to maintain the original size of the System.Windows.Forms.ComboBox based on the space requirements of your form, set this property to false. If the System.Windows.Forms.ComboBox does not contain any items, this property has no effect.
Setting the ComboBox.DropDownHeight property resets the ComboBox.IntegralHeight property to false.
If the ComboBox.DrawMode property is set to OwnerDrawVariable, this property has no effect.