trying to use an SPWeb object that has been closed or disposed and is no longer valid

Question

Can somebody please tell me what is wrong with this code?

protected void Button1_Click(object sender, EventArgs e) { using (SPWeb oWebsiteRoot = SPContext.Current.Site.RootWeb) {

            SPList oList = oWebsiteRoot.Lists["Tasks"];

            SPQuery oQuery = new SPQuery();
            oQuery.Query = "<Where><Eq><FieldRef Name='Status'/>" +
                "<Value Type='Text'>Completed</Value></Eq></Where>";
            SPListItemCollection collListItems = oList.GetItems(oQuery);

            foreach (SPListItem oListItem in collListItems)
            {
                Response.Write(SPEncode.HtmlEncode(oListItem["Title"].ToString()) +
                    "<BR>");
            }
        }

    }

Answer 1

Basically you should not dispose the Rootweb, if you are using the SPContext. Microsoft has updated the best practices

here is one example mentioning

http://blogs.msdn.com/b/rogerla/archive/2008/10/04/updated-spsite-rootweb-dispose-guidance.aspx

Answer 2

Are u disposing any SPWeb or SPSite object that you intantiated using the SPContext object? If so then you need not to dispose any of them.