Server Error in '/search' 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 21:         //Get QueryString for Article ID
Line 22: 
Line 23:         articleID = Int32.Parse(Request.QueryString["article"].ToString());
Line 24: 
Line 25:         //If Parse fails error page will be called from web.config

Source File: e:\wwwroot\Cases\search\articleDetail.aspx.cs    Line: 23

Stack Trace:

[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +267
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +175
   search_articleDetail.Page_Load(Object sender, EventArgs e) in e:\wwwroot\Cases\search\articleDetail.aspx.cs:23
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +154
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4082


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4108.0