[c#] How do I set combobox read-only or user cannot write in a combo box only can select the given items?

I am facing a problem in setting the combo property such that only user can select the values form given items, but I cannot write in the combo box.

How can I do so in C#?

Make the DropDownStyle to DropDownList

stateComboBox.DropDownStyle = ComboBoxStyle.DropDownList;

I think you want to change the setting called "DropDownStyle" to be "DropDownList".

In the keypress event handler:

e.Handled = true;

Try this:

    private void comboBox1_KeyDown(object sender, KeyEventArgs e)
    {
        // comboBox1 is readonly
        e.SuppressKeyPress = true;
    }

The solution is to change the DropDownStyle property to DropDownList. It will help.