Error: 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 System.Convert.ToInt32(String value) at category.PopulateParentCategory(String strParentID) in c:\Inetpub\Websites\perfectsafetysigns_com\category.aspx.cs:line 74