C＃：如何控制ComboBox中显示的当前项索引？

I have set a list of items in a combobox, but when I debug the application, I have to select an item from the drop down to display an item by default. Is there a property? that you can set so that the combobox itemindex will always begin at 0 meaning the first item in the list at startup of the application?I have set a list of items in a combobox, but w