Server Error in '/' Application.

Input string was not in a correct format.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.FormatException: Input string was not in a correct format.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[FormatException: Input string was not in a correct format.]
System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +2753091
System.Number.ParseInt64(String value, NumberStyles options, NumberFormatInfo numfmt) +112
System.Int64.Parse(String s) +20
WK.HY.JianCai.IPScaner.IpToInt(String ip) +461
WK.HY.JianCai.IPScaner.QQwry() +315
WK.HY.JianCai.IPScaner.IPLocation(Boolean isLocal) +40
WK.HY.JianCai.Index.RUrl() +582
WK.HY.JianCai.Index.Page_Load(Object sender, EventArgs e) +320
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +34
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +47
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061
Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42