System.FormatException: Input string was not in a correct format. at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at lambda_method(Closure , SPListItem ) at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source) at lambda_method(Closure ) at Microsoft.SharePoint.Linq.SPLinqProvider.Execute[T](Expression expression) at COL.Blog.BlogPostItem.BlogPostItemUserControl.Page_Load(Object sender, EventArgs e)