protected void Brand_Change(object sender, EventArgs e)
{
List <string> list = new List <string>();
foreach (ListItem item in ComputerBrand.Items)
{
if (item.Selected)
{
list.Add(item.Value);
}
}
if (list.Count == 0)
{
list = new List <string>(getBrandList());
}
SessionData data = (SessionData)Session["data"];
data.BrandList = list;
Session["data"] = data;
ComputerList.DataBind();
}