Asp.net system web error

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Hi all,
In my asp.net app. I use dropdownlist selected value like this:

JavaScript

var brand = document.getElementById('<%=ddlBrands.ClientID%>');
var brandid = brand.options[brand.selectedIndex].value;
var searchUrl = 'SearchResponse.aspx?brand=' + brandid;

In searchResponse page I convert brand from string to Int32 because I use it as parameter to SQL SP.

C#

Int32 brandId=0;
if (Request.QueryString["brand"] != "")
  { brandId = Convert.ToInt32(Request.QueryString["brand"]); }

Everything seems to work well locally, but when I uploaded the app to the server sometimes I get this error:

C#

error message: Exception of type 'System.Web.HttpUnhandledException' was thrown.
error Source: System.Web
error stack trace: at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.searchresponse_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\c9279761\e5a0f74a\App_Web_eywnmdzj.11.cs:line 0 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
error inner stack trace: 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 ResponsiveAutoMobSite.SearchResponse.Page_Load(Object sender, EventArgs e) in \\hv1\webdev$\WebFolder\RESPONSIVE2014-03-26\responsive2014-03-24\ResponsiveAutoMobSite\ResponsiveAutoMobSite\SearchResponse.aspx.cs:line 30 at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
error inner Message: Input string was not in a correct format.

Line30 is the line i convert from string to Int32.
I don't know why this error is thrown on the server not locally and what could be the reason if i convert?
Please advise

Thanks in advance.

Posted 13-May-15 6:46am

Samira Radwan

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Afzaal Ahmad Zeeshan · Accepted Answer · 2015-05-13T07:05:00

The main exception (HttpUnhandledException) would never give you a very good message of what the problem is. The problem in this context is in the inner message. Inner message states,

Quote:
Input string was not in a correct format.

So, the solution is that you are not providing a string value that can be converted to integer value. Your variable type is not a problem. I believe it is being thrown at,

C#

Convert.ToInt32(Request.QueryString["brand"]);

You need to check what value is being passed as "Request.QuerySring["brand"]". It must be a numeric value. Instead of this, I would try using the int.TryParse(string, out int)[^] method which would check whether the number can be converted to integer or not. It won't break your application.

C#

int brandId = 0;  // int == Int32
int.TryParse(Request.QueryString["brand"], out brandId);

This code would minimize the exception chances now and would allow you to use a condition. Something like this,

C#

int brandId = 0;  // int == Int32
if(int.TryParse(Request.QueryString["brand"], out brandId)) {
   // Converted
} else { 
   // Not Converted
}

Value is stored in the "brandId" variable of your application.