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

If you're trying to alter values for a just inserted list item, you should go with:

SPList list = web.Lists["ListName"];
//SPListItem item = list.Items.Add();
//item["PercentComplete"] = .45; // 45%
//item.Update();

SPListItemCollection items = list.GetItems(new SPQuery()
{
    Query = @"
                
                   
                   Desigining
                
              "
});

foreach (SPListItem item in items)
{
    item["PercentComplete"] = .45; // 45%
    item.Update();
}

You just need to use list.Items[uniqueId] or faster list.GetItemByUniqueId(uniqueId) if you needs to find a particular item to update; what can be accomplished by using SPQuery class.