How to make Windows form Dropdownbox readonly

Problem:

I want my Windows Form Dropdownbox to be read only and not allow any type.

Solution:

Add in the “KeyDown” event the below functionality:

        private void cboStudientType_KeyDown(object sender, KeyEventArgs e)
        {
            char ch = (char)e.KeyValue;
            if (!char.IsControl(ch))
            {
                string newTxt = this.cboStudientType.Text + ch;
                bool found = false;
                foreach (System.Data.DataRowView item in this.cboStudientType.Items)
                {
                    string itemString = item.ToString();
                    if (itemString.StartsWith(newTxt, StringComparison.CurrentCultureIgnoreCase))
                    {
                        found = true;
                        break;
                    }
                }
                if (!found)
                    e.SuppressKeyPress = true;
            }
        }