I recently encounter this C# issue: “combobox going blank after losing focus” while developing a billing and collection system for the organization where I am currently working. I usually fill the combobox with List items. See the sample code below:

The problem with this code when I use the usual combobox control, it goes blank after it change focus.

I fixed this issue by creating a new combobox class. Here’s what the class looks like:

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