I'm using a sandbox solution. I'm trying to add some items to a list from a button click in my webpart.

It seems easy but with sandbox everything becomes difficult.

I'm getting an exception when I do the update(). Here is my code:

if(listToLoad != null)
SPListItem newItem = listToLoad.Items.Add();
            newItem["Title"] = "test";
            //newItem["FieldTitle"] = web.ServerRelativeUrl;
                //newItem["ContentTypeId"] = spCType.Id.ToString();
                //newItem["FieldUrl"] = web.ServerRelativeUrl;
                //newItem["ParentNewsLetter"] = test["FieldTitle"].ToString();
                //newItem["UserGroupName"] = test["UserGroupName"].ToString();
                /*********Exception occurs here*********/

                lbl_message.Text += web.ServerRelativeUrl + "added for parent: " + test["FieldTitle"].ToString() + " and group: " + test["UserGroupName"].ToString() + "<br>";

                foreach (SPWeb _web in web.Webs)
                    LoopThrowSite(_web, test);
            catch (Exception ex)
                throw ex;

Here is the common exception for sandbox.

Microsoft.SharePoint.SPException: The sandboxed code execution request was refused because the Sandboxed Code Host Service was too busy to handle the request

I tried another project as a farm solution and it works, so the issue comes from the sandbox solution. Do you know an alternative to make it work?

  • Do other sandboxed solutions work? It might not be an issue with the code. See if this link helps: sharepointknowledgebase.blogspot.com/2014/03/…
    – wjervis
    Jul 16, 2014 at 11:19
  • Try by restarting Sandboxed Code Host Service. Jul 16, 2014 at 11:21
  • yes it works in farm solution but i don't have access to the farm. Do you know an alternative to use a sandbox solution Jul 16, 2014 at 11:24
  • i've restarted sevice: Microsoft SharePoint Foundation Sandboxed Code Service without success. Is it possible to do this in sandboxsolution? else do you have an other solution? Jul 16, 2014 at 11:31
  • Try a different sandboxeded solution. Farm solutions don't run on SPUCWorkerProcess.exe.
    – wjervis
    Jul 16, 2014 at 11:35

2 Answers 2


listToLoad.Update() is not required to add an item. newItem.Update() should be enough.

  • ok but my issue is that newItem thow the exception so my item is never added Jul 16, 2014 at 10:18
  • Have you set yourspweb.AllowUnsafeUpdates = true; ?
    – Sudhakar
    Jul 16, 2014 at 10:20
  • yes i've setted to true before with no more success. Jul 16, 2014 at 10:28
  • How did you get handle of listToLoad? It has to be SPList listToLoad= yourweb.Lists["ListName"];
    – Sudhakar
    Jul 16, 2014 at 10:50
  • yes i got the list with SPList listToLoad= yourweb.Lists["ListName"]; and i tets if it's not null so it seems to be correct. Jul 16, 2014 at 10:52

it's not allowed to add item in sandbox solution so i developped a client script to complete this action

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