private void BtnAdd_Click(object sender, EventArgs e)
 {
     if (Block)
     {
         return;
     }
     try
     {
         int total_items = SitesDataGrid.Rows.Count;
         if (total_items < MainCache.MaxSlots)
         {
             SitesManager.AddNew();
             InitializeEditor();
         }
         else
         {
             MessageBox.Show("Sorry you reached the maximum Urls for your membership!\nPlease Upgrade to Super Shark to have unlimited slots for life!");
         }
     }
     catch (Exception x)
     {
         MessageBox.Show(x.ToString());
     }
 }