Getting Data from Subsites to TopSite With Null Checking which is getting binded with SpGridView Using Server Side Linq

try
{
string Title = string.Empty;
string Status = string.Empty;
string AssignedTo = string.Empty;
string WebTitle = string.Empty;
var query = from SPWeb subWeb in SPContext.Current.Web.GetSubwebsForCurrentUser()
from SPListItem item in subWeb.Lists["Tasks"].Items
orderby item["ID"] descending
select new
{
Title=item["Title"].ToString(),
Status=(item["Status"]==null) ? "Data UnAvailable" : item["Status"].ToString(),
Priority = (item["Priority"] == null) ? "Data UnAvailable" : item["Status"].ToString(),
AssignedTo = (item["AssignedTo"] == null) ? "Data UnAvailable" : item["AssignedTo"].ToString().Substring(item["AssignedTo"].ToString().LastIndexOf("\\") + 1),
WebTitle=subWeb.Title
};
if (query.Count() > 0)
{
sgvTest.DataSource = query;
sgvTest.DataBind();
}
}
catch (Exception ex)
{
this.Controls.Add(new LiteralControl(ex.ToString()));
}