protected void DeleteListItem()
 {
     try
     {
         List testeList = context.Web.Lists.GetByTitle("Teste");
         Microsoft.SharePoint.Client.ListItem item = testeList.GetItemById(6);
         item.DeleteObject();
         context.ExecuteQuery();
     }
     catch (Exception ex)
     {
         lbl1.Text = ex.Message;
         throw;
     }
 }
 protected void UpdateListItem()
 {
     try
     {
         List testeList = context.Web.Lists.GetByTitle("Teste");
         Microsoft.SharePoint.Client.ListItem item = testeList.GetItemById(1);
         item["Title"] = "Nome alterado via código";
         item.Update();
         context.ExecuteQuery();
     }
     catch (Exception ex)
     {
         lbl1.Text = ex.Message;
         throw;
     }
 }