Solved

c#, ignore the error in catch (as in try catch)

Posted on 2014-11-15
3
173 Views
Last Modified: 2014-11-15
In a list box, when I click on an item, this code puts the selected item on the screen. One of the items reads <All> which put the program in panic and produces the error below:

Question: How can I find the error number for this instance and pacify the error?
try
{
   Response.Write(lstCity.SelectedItem.Text); 
}
  catch (Exception ex)
{
  // *********find the error number when lstCity.SelectedItem.Text == <All> and pacify the error
}

Open in new window

Error message when <All> is selected:
Server Error in '/' Application.

A potentially dangerous Request.Form value was detected from the client (lstCity="<All>").

Description: ASP.NET has detected data in the request that is potentially dangerous because it might include HTML markup or script. The data might represent an attempt to compromise the security of your application, such as a cross-site scripting attack. If this type of input is appropriate in your application, you can include code in a web page to explicitly allow it. For more information, see http://go.microsoft.com/fwlink/?LinkID=212874. 

Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (lstCity="<All>").

Source Error: 


[No relevant source lines]

Source File: c:\Users\Mike\AppData\Local\Temp\Temporary ASP.NET Files\vs\0db659aa\1e56896f\App_Web_1ohlj355.0.cs    Line: 0 

Stack Trace: 


[HttpRequestValidationException (0x80004005): A potentially dangerous Request.Form value was detected from the client (lstCity="<All>").]
   System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) +9693725
   System.Web.<>c__DisplayClass5.<ValidateHttpValueCollection>b__3(String key, String value) +18
   System.Web.HttpValueCollection.EnsureKeyValidated(String key) +9693093
   System.Web.HttpValueCollection.GetValues(String name) +17
   System.Web.UI.WebControls.ListBox.LoadPostData(String postDataKey, NameValueCollection postCollection) +51
   System.Web.UI.WebControls.ListBox.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +15
   System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +303
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6704
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +245
   System.Web.UI.Page.ProcessRequest() +72
   System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +21
   System.Web.UI.Page.ProcessRequest(HttpContext context) +58
   ASP.default_aspx.ProcessRequest(HttpContext context) in c:\Users\Mike\AppData\Local\Temp\Temporary ASP.NET Files\vs\0db659aa\1e56896f\App_Web_1ohlj355.0.cs:0
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +341
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34237

Open in new window

0
Comment
Question by:Mike Eghtebas
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 34

Accepted Solution

by:
it_saige earned 400 total points
ID: 40444879
You could rewrite it like this:
try
{
	Response.Write(lstCity.SelectedItem.Text); 
}
catch (HttpRequestValidationException ex)
{
	if (ex.Message.Contains("lstCity = <All>"))
		Response.Write(lstCity.SelectedItem.Text);
	else
	{
		// This is really an exception, do some logging
	}
}
catch (Exception ex)
{
	// Do something logging.
}

Open in new window


But I would recommend that you choose a different item to represent <ALL>, like -ALL-, or just All Cities.

-saige-
0
 
LVL 36

Assisted Solution

by:Miguel Oz
Miguel Oz earned 100 total points
ID: 40444892
AS suggested by Saige you need a different string to represent <ALL>, this string  is not valid because it contains "<" and ">" .
0
 
LVL 34

Author Closing Comment

by:Mike Eghtebas
ID: 40444902
I used -All-
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
Performance in games development is paramount: every microsecond counts to be able to do everything in less than 33ms (aiming at 16ms). C# foreach statement is one of the worst performance killers, and here I explain why.
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…

691 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question