protected void Button4_Click(object sender, EventArgs e)
{
RequestLeaveRequest request = new RequestLeaveRequest();
request.Username = Session["Username"].ToString();
request.StartDate = CalendarStartDate.SelectedDate.ToString();
request.EndDate = CalendarEndDate.SelectedDate.ToString();
request.LeaveType = DropDownLeaveTypes.SelectedItem.ToString();
request.Reason = txtReason.Text;
DAT.LeaveRequest(request);
Response.Write("<script language='javascript'>alert('Successfully Added Request!.')</script>");
}