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@Muhammedh's solution to use Regex is very good. Great Regex, but you can do better! According to this support article from Microsoft not only are the special characters not allowed, but certain file extensions are also not allowed! And using _vti is not allowed either - so many restrictions! Here's a Regex that takes all of them into account: ...


Found the solution... Here's how I changed my code. private void UploadAttachments(Helper sharePointHelper, IList<HttpPostedFile> postedFileCollection, int itemId) { // Get the list SPList listToUpdate = Helper.GetList(this.BackendListName); SPListItem itemToUpdate = null; // Get the existing item to update itemToUpdate = ...

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