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:

Line 175:        GetContentType(M_LanguageType);
Line 176:        if (Request.QueryString["LANGUAGETYPE"] != null)
Line 177:            M_LanguageType = int.Parse(ToolClass.TextToSql(Request.QueryString["LANGUAGETYPE"]));
Line 178:        //else if (Request.QueryString["LANGUAGETYPE"] != 10 || Request.QueryString["LANGUAGETYPE"] != 20)
Line 179:        //    M_LanguageType = 10;

Source File: e:\wwwwroot\\www\WebIndex.aspx.cs    Line: 177

Stack Trace:

[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +9594411
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +119
   System.Int32.Parse(String s) +23
   WebIndex.Page_Load(Object sender, EventArgs e) in e:\wwwwroot\\www\WebIndex.aspx.cs:177
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1