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.Int32.Parse(String s) at CADInfo.charges.Page_Load(Object sender, EventArgs e) in C:\Users\Administrator\source\repos\CADInfo\CADInfo\charges.aspx.cs:line 23