c# - How to check whether the URL is valid or not -


this question has answer here:

i have 1 textbox in user enter url, if want check url while page rendering do?

here code:

protected void btnrender_click(object sender, eventargs e) {     string strresult = string.empty;     webresponse objresponse;     webrequest objrequest = system.net.httpwebrequest.create(urltxt.text);     objresponse = objrequest.getresponse();     using (streamreader sr = new streamreader(objresponse.getresponsestream()))     {         strresult = sr.readtoend();         sr.close();     }     strresult = strresult.replace("<form id='form1' method='post' action=''>", "");     strresult = strresult.replace("</form>", "");               textbox1.text = strresult.trim();     div.innerhtml = strresult.trim(); }

i have code check whether url valid or not, can please tell me call this? {if want check https how can in code}

 protected bool checkurlexists(string url)     {         // if url not contain http. add it.       // if want check https how can do.this code http not https         if (!url.contains("http://"))         {             url = "http://" + url;         }         try         {             var request = webrequest.create(url) httpwebrequest;             request.method = "head";             using (var response = (httpwebresponse)request.getresponse())             {                 return response.statuscode == httpstatuscode.ok;             }          }          catch          {              return false;          }      }

the textbox name urltxt

try below, you....

     protected void btnrender_click(object sender, eventargs e)         {             if(checkurlexists(urltxt.text))             {                 string strresult = string.empty;                 webresponse objresponse;                 webrequest objrequest = system.net.httpwebrequest.create(urltxt.text);                 objresponse = objrequest.getresponse();                 using (streamreader sr = new streamreader(objresponse.getresponsestream()))                 {                     strresult = sr.readtoend();                     sr.close();                 }                 strresult = strresult.replace("<form id='form1' method='post' action=''>", "");                 strresult = strresult.replace("</form>", "");                 textbox1.text = strresult.trim();                 div.innerhtml = strresult.trim();             }             else             {                 messagebox.show("not valid url");             }         }

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