I have some combo-boxes that are set up as drop down lists, and the user can pick a number in them. I also have a Clear button that should clear the text from the combo boxe
Use:
comboBox1.ResetText();
and it's done.
Docs: ComboBox.ResetText Method (Namespace: System.Windows.Forms) https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.combobox.resettext?view=netframework-4.8