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 System.Int16.Parse(String s, NumberStyles style, NumberFormatInfo info)
at System.String.System.IConvertible.ToInt16(IFormatProvider provider)
at System.Convert.ToInt16(Object value)
at ttgd.Page_Load(Object sender, EventArgs e) in e:\domains\nhadatgiaminh.com\wwwroot\ttgd.aspx.cs:line 156
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