How to update field value in current item via event receiver? - sharepoint

Question

EDIT: I've realized that my approach in the second code block was unnecessary. I could accomplish the same thing by doing the following in ItemUpdated:
SPListItem thisItem = properties.ListItem;
thisItem.File.CheckOut();
thisItem["Facility Number"] = "12345";
thisItem.Update();
thisItem.File.CheckIn("force check in");
Unfortunately, I'm still getting the same error message when "thisItem.Update();" is executed: he sandboxed code execution request was refused because the Sandboxed Code Host Service was too busy to handle the request
I actually was receiving the error above when deploying my sandbox solution originally and used this link (http://blogs.msdn.com/b/sharepointdev/archive/2011/02/08/error-the-sandboxed-code-execution-request-was-refused-because-the-sandboxed-code-host-service-was-too-busy-to-handle-the-request.aspx) to fix it.
I am trying to write a C# event receiver that changes the value of a field when a document is added/changed in a library. I have tried using the following code:
public override void ItemUpdating(SPItemEventProperties properties)
{
base.ItemUpdating(properties);
string fieldInternalName = properties.List.Fields["Facility Number"].InternalName;
properties.AfterProperties[fieldInternalName] = "12345";
}
Unfortunately, this is only working for certain fields. For example, if I replaced "Facility Number" with "Source", the code will execute properly. This may be the fact that we are using a third party software (called KnowledgeLake) that replaces the default edit form in SharePoint with a Silverlight form. Anyway, because I was having challenges with the code above (again, because I think the Silverlight form may be overriding the field after the ItemUpdating event fires), I have tried the following code:
public override void ItemUpdated(SPItemEventProperties properties)
{
base.ItemUpdated(properties);
//get the current item
SPListItem thisItem = properties.ListItem;
string fieldName = "Facility Number";
string fieldInternalName = properties.List.Fields[fieldName].InternalName;
string fieldValue = (string)thisItem["Facility Number"];
if (!String.IsNullOrEmpty(fieldValue))
{
//properties.AfterProperties[fieldInternalName] = "123456789";
SPWeb oWebsite = properties.Web as SPWeb;
SPListItemCollection oList = oWebsite.Lists[properties.ListTitle].Items;
SPListItem newItem = oList.GetItemById(thisItem.ID);
newItem.File.CheckOut();
thisItem[fieldInternalName] = "12345";
thisItem.Update();
newItem.File.CheckIn("force");
}
}
First off, the above seems a little klunky to me as I would love to just use the AfterProperties method. Additionally, I am getting the following error when "newItem.Update()" is executed: he sandboxed code execution request was refused because the Sandboxed Code Host Service was too busy to handle the request
Am I missing something here? I would love to utilize the first code block. Any help would be appreciated.

Answer 1

Josh was able to answer his own question, which helped me fix my problem as well. Here is a working code snippit.
public override void ItemUpdated(SPItemEventProperties properties)
{
string internalName = properties.ListItem.Fields[columnToUpdate].InternalName;
//Turn off event firing during item update
base.EventFiringEnabled = false;
SPListItem item = properties.ListItem;
item[internalName] = newVal;
item.Update();
//Turn back on event firing
base.EventFiringEnabled = true;
base.ItemUpdated(properties);
}