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 50:             {
Line 51:                 var a = Request.QueryString["p"];
Line 52:                 whichpage = Convert.ToInt32(Request.QueryString["p"]);
Line 53:                 pag += "/" + whichpage.ToString();
Line 54:             }

Source File: d:\Websites\bp3\CategoryProducts.aspx.cs    Line: 52

Stack Trace:


[FormatException: Input string was not in a correct format.]
   System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) +14524616
   System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) +172
   System.Convert.ToInt32(String value) +60
   CategoryProducts.Page_Load(Object sender, EventArgs e) in d:\Websites\bp3\CategoryProducts.aspx.cs:52
   System.Web.UI.Control.OnLoad(EventArgs e) +106
   System.Web.UI.Control.LoadRecursive() +68
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3770.0