protected void DropDownList3_TextChanged(object sender, EventArgs e)
    {
        //Date
        String strDateTime = DropDownList3.SelectedValue.ToString() + " " + DropDownList1.SelectedValue.ToString() + ":" + DropDownList2.SelectedValue.ToString();
        DetailsViewRow row = DetailsView1.Rows[0];
        row.Cells[1].Text = strDateTime;
    }