private void comboBoxEdit1_Properties_MouseEnter(object sender, EventArgs e)
 {
     comboBoxEdit1.Properties.Items.Clear();
     searchdispatchdatatable = SQLMethod.Search_dispatchdatatable();
     for (int i = 0; i < searchdispatchdatatable.Count; i++)
     {
         comboBoxEdit1.Properties.Items.Add(searchdispatchdatatable[i].projectno);
     }
 }