protected void btnadd_Click(object sender, EventArgs e)
 {
     if (lstadded.SelectedValue.Equals(""))
     {
         LtMes.Visible = false;
         GroupsItems.InsertGroupsItems(lstnotadded.SelectedValue, iid, "", DateTime.Now.ToString(), DateTime.Now.ToString(), DateTime.Now.ToString(), "");
         lstnotadded.Items.Clear();
         lstadded.Items.Clear();
         GetGroupsPhotoAlbum();
     }
     else
     {
         LtMes.Visible = true;
         LtMes.Text    = "<div class='MesText'>Album đã trong nhóm <b>" + GroupsExtension.GetNameCategoryById(lstadded.SelectedValue) + "</b></div>";
         return;
     }
 }
 protected void btnremove_Click(object sender, EventArgs e)
 {
     if (lstnotadded.SelectedValue.Equals(""))
     {
         LtMes.Visible = false;
         condition     = " IGID = " + lstadded.SelectedValue + " AND IID = " + iid + " ";
         GroupsItems.DeleteGroupsItems(condition);
         lstnotadded.Items.Clear();
         lstadded.Items.Clear();
         GetGroupsPhotoAlbum();
     }
     else
     {
         LtMes.Visible = true;
         LtMes.Text    = "<div class='MesText'>Album này chưa trong nhóm <b>" + GroupsExtension.GetNameCategoryById(lstnotadded.SelectedValue) + "</b></div>";
         return;
     }
 }