SharePoint 2010 / MSOCAF - Call to Microsoft.SharePoint.SPItemEventProperties.OpenWeb() on Sharepoint 2010. Use Microsoft.SharePoint.SPItemEventProperties.get_Web Property instead.

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If you are using the following code:
SPWeb web = properties.OpenWeb();
and are getting the following error:

Call to Microsoft.SharePoint.SPItemEventProperties.OpenWeb() on Sharepoint 2010.  Use Microsoft.SharePoint.SPItemEventProperties.get_Web Property instead.

You will need to update the code to the following, and it should remedy the error:
SPWeb web = properties.Web;

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