private string Serialize(SessionStateItemCollection items)
{
MemoryStream ms = new MemoryStream();
BinaryWriter writer = new BinaryWriter(ms);
List<string> itemsABorrar = new List<string>();
foreach (string item in items.Keys)
{
if (!(items[item].GetType().IsSerializable))
itemsABorrar.Add(item);
}
foreach(string item in itemsABorrar)
items.Remove(item);
if (items != null)
{
items.Serialize(writer);
}
writer.Close();
return Convert.ToBase64String(ms.ToArray());
}