Combobox selection control not coming out

I'm working with winforms comboboxes. When I select any item in combobox I've raised an event. But control can not come outside. When I scroll the mouse the selected event changing every time.

how开发者_运维知识库 to prevent this?

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The mouse scrolling actually does change the item selection in the combobox and hence your event is fired, you don't want your event handling code on mouse scroll?

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If the problem is that you cannot use the mouse wheel to open drop-down portion of the combobox, then you can use ComboBox.DroppedDown property.