private void cBoxTo_TextUpdate(object sender, EventArgs e)
 {
     try
     {
         AutocompleteHelper autocomplete = new AutocompleteHelper();
         autocomplete.Autocomplete(cBoxTo);
     }
     catch
     {
         MessageBox.Show("There are too many serverrequests!\nPlease wait... ");
     }
 }
        private void cBoxFrom_TextUpdate(object sender, EventArgs e)
        {
            AutocompleteHelper autocomplete = new AutocompleteHelper();

            autocomplete.Autocomplete(cBoxFrom);
        }