c# - extract text content from web page using asp.net web form -

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i'm trying load page may asp.net web form , extract text , display extracted text in areatext

like this:

and code is:

<%@ page language="c#" autoeventwireup="true" codefile="default.aspx.cs" inherits="_default" %>  <!doctype html>  <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server">     <title></title>     <style type="text/css">         #form1 {             height: 500px;             width: 1199px;         }         .auto-style1 {}         #textarea1 {             height: 288px;             width: 1157px;         }     </style> </head> <body>      <form id="form1" runat="server">         <asp:button id="button1" runat="server"  text="clike me"                      onclick="button1_click" onclientclick="aspnetform.target ='_blank';"                             width="160px" cssclass="auto-style1" height="32px" />         <br />         <br />         <asp:radiobuttonlist id="radiobuttonlist1" runat="server">             <asp:listitem>cnn</asp:listitem>             <asp:listitem>bbc</asp:listitem>             <asp:listitem>fox</asp:listitem>         </asp:radiobuttonlist>         <br />         <br />         <textarea id="textarea1" name="s1" runat="server" ></textarea></form> </body> </html>

and

    using system; using system.collections.generic; using system.linq; using system.web; using system.web.ui; using system.web.ui.webcontrols; using system.io; using system.drawing; using system.threading; using system.windows.forms;  public partial class _default : system.web.ui.page {     uri url = null;     webbrowser wb = new webbrowser();      protected void button1_click(object sender, eventargs e)     {          wb.documentcompleted += new webbrowserdocumentcompletedeventhandler(displaytext);          if (radiobuttonlist1.text == "cnn")         {             url = new uri("http://www.edition.cnn.com/");             wb.url = url;             //response.redirect(url);         }         else if (radiobuttonlist1.text == "bbc")         {             url = new uri("http://www.bbc.com/");             wb.url = url;         }         else         {             url = new uri("http://www.foxnews.com/");           wb.url = url;         }      }      private void displaytext(object sender, webbrowserdocumentcompletedeventargs e)     {          webbrowser wb = (webbrowser)sender;          wb.document.execcommand("selectall", false, null);          wb.document.execcommand("copy", false, null);          textarea1.value = clipboard.gettext();      }       protected void page_load(object sender, eventargs e)     {      }  }

but have error in line 

 webbrowser wb = new webbrowser();

activex control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot instantiated because current thread not in single-threaded apartment.

so i'm doing wrong pleas , many in advance

i have never attempted use webbrowser in object-reference, know being web-form means receiving post backs, , if re-instantiate browser reference each time, isn't going operate page object. use page object, can collect controls , methods needed, while utilizing request/response namespaces. match on radiobuttonlist control code below:

 protected void page_load(object sender, eventargs e)     {         if (page.ispostback)          {              string url;              radiobuttonlist rdl = new radiobuttonlist();              url = rdl.selecteditem.text;          }       }

of course you'd grab .selecteditem.text markup-based radiobuttonlist, instead of building one.

i checked, , seems webbrowser object under system.windows.forms. experience, never want use library in web forms (bad experiences msgbox).

i'd refactor using sample above , 

response.redirect(url);

hope helps!


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