AllowUnsafeUpdates VS RunWithElevatedPrivileges
AllowUnsafeUpdates: If your code modifies Windows SharePoint Services data in some way, you may need to allow unsafe updates on the Web site, without requiring a security validation. You can do by setting the AllowUnsafeUpdates property. PList list= web.Lists["MyList"]; SPListItemCollection items= list.GetItems(); web.AllowUnsafeUpdates = true; foreach (SPListItem item in items) { item["Title"] = "New Title"; item.Update(); } web.AllowUnsafeUpdates = false; RunWithElevatedPrivileges : There are certain object model calls model that require site-administration privileges. To bypass access-denied error, we use RunWithElevatedPrivileges property when request is initiated by a nonprivileged user. We can successfully make calls into the object model by calling the RunWithElevatedPrivileges method provided by the SPSecurity class. SPSecurity.RunWithElevatedPrivileges(delegate() { using (SPSite site = new SPSit...