void ibtnDelete_Click(object sender, ImageClickEventArgs e)
{
for (int i = 0; i < trvCategory.CheckedNodes.Count; i++)
{
int CategoryID = Convert.ToInt32(trvCategory.CheckedNodes[i].Value);
CategoryManager.DeleteLogical(CategoryID);
}
FillCategoryTree();
ExitMode();
upnlCategoryItem.Update();
}
#endregion