Update Sharepoint List Item

Question

I got following error...

System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.SharePoint.SPListItem.get

Answer 1

Try calling Update () on the list before getting the UniqueID

 SPList list = web.Lists["ListName"]; // 2        
 SPListItem item = list.Items.Add();
 item["Title"] = "Test";
 item.Update ();
 list.Update ();
 Guid itemId = item.UniqueId;