c# - Using try-catch and if-else statement to open new browser window -

using: c# , .net

i want use try catch display image of product in new window window. works unless image not exist meaning (http error 404 - file or directory not found) page. if happens button nothing when clicked.

what want happen when click button , file not exist user taken "image not exist" page. have tried in following code. not work. advice!

        bool imageexists = true;          try         {             webresponse = webrequest.getresponse();         }         catch         {             imageexists = false;         }          if (imageexists == true)         {             clientscript.registerstartupscript(this.gettype(), "openfoundimage", "window.open('" + pathtofolder + "');", true);         }         else         {             system.diagnostics.process.start("http://www.companysite.com/noimage.jpg");         } 

edit: changed bool.

try catch won't trigger in this. see link below

how to: request data using webrequest class

4.. can access properties of webresponse or cast webresponse protocol-specific instance read protocol-specific properties. example, access http-specific properties of httpwebresponse, cast webresponse httpwebresponse reference. following code example shows how display status information sent response.

console.writeline (((httpwebresponse)response).statusdescription);

add logic around status return.