add an SPListItem from a web part

Question

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;
            try
            {
                //newItem["ContentTypeId"] = spCType.Id.ToString();
                //newItem["FieldUrl"] = web.ServerRelativeUrl;
                //newItem["ParentNewsLetter"] = test["FieldTitle"].ToString();
                //newItem["UserGroupName"] = test["UserGroupName"].ToString();
                /*********Exception occurs here*********/
                newItem.Update();
                listToLoad.Update();

                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?

Answer 1

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

Answer 2

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