forms - ASP.Net Login redirect using DestinationPageUrl -

i have created login form , i'm trying redirect user admin panel if login successful. in php used redirect response.redirect() in asp.net see login form has destinationpageurl property. how trigger 1 if login successful? i'm using mysql.

here's code login event:

        protected void loginform_authenticate(object sender, authenticateeventargs e)     {         string username = loginform.username.tostring();         string password = loginform.password.tostring();         list<string> errors = new list<string>();         regex rg = new regex("^[a-z0-9_-]{3,16}$");          if (string.isnullorwhitespace(username))         {             errors.add("username empty\n");         }         else if (!rg.ismatch(username))         {             errors.add("username can contain alphanumeric letters, - , _\n");         }          if (string.isnullorwhitespace(password))         {             errors.add("password empty\n");         }          string queryrows = "select count(*) users username = ? , password = ?";         database db = new database();         mysqlcommand cmd = new mysqlcommand(queryrows, db.getcon());          cmd.parameters.addwithvalue("", username);         cmd.parameters.addwithvalue("", password);         db.open();         object result = cmd.executescalar();         db.close();          int numrows = 0;          if (result != null)         {             numrows = convert.toint32(result);         }          if (numrows > 0)         {             response.redirect("~/admin/admin.aspx");          }         else         {             loginform.failuretext = "<br /><br />user credentials invalid.";         }     } 

the destinationpageurl property specifies page displayed when  

login attempt successful. default behavior of login control return user referring page, or page defined in defaulturl attribute of forms element in web.config file.

jus go through link more details:

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.login.destinationpageurl.aspx