private void dgv_InInfo_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            if (dgv_InInfo.CurrentCell.OwningColumn.Name == "ModelCell")
            {
                ocnn = new OleDbConnection(connections);
                ocnn.Open();
                string name = dgv_InInfo.CurrentRow.Cells[2].Value.ToString();
                string sql = "select * from MIS_MaterielRegiser where MR_Name='" + name + "'";
                ocmd = new OleDbCommand(sql,ocnn);
                oda = new OleDbDataAdapter(ocmd);
                DataSet ds = new DataSet();
                oda.Fill(ds);
                ((ComboBox)e.Control).DropDownStyle = ComboBoxStyle.DropDown;
                ((ComboBox)e.Control).DataSource = ds.Tables[0];
                ((ComboBox)e.Control).DisplayMember = "MR_Model";
            }
        }