private void LoadUsers()
{
string area_code = ddlAreas.SelectedValue.ToString();
int area_id = int.Parse(area_code);
d_table = data_file.GetUsersByArea(area_id);
ddlUsers.DataSource = d_table;
ddlUsers.DataValueField = "Username";
ddlUsers.DataTextField = "FullName";
ddlUsers.DataBind();
}
