Question

I created silver-light 4.0 application in that user can enter their username and password.
After submit this secret data(username, password ) from SL application,
it submitted to website with query string..
I want to pass as below URL string
for ex: –  
http://testsite.com/mypage.aspx?<encrypted string>

I want to pass username and password in encrypted format from SL to Aspx page..
How I pass those information from SL application to asp.net website..

Answer 1

So you could just use the WebClient class and GET the page.

(I’m assuming your doing asp.net WebForms NOT MVC)

Your asp.net page should be a blank page, in your code behind you read your query string and do what you need with it, depending on success or failure you write the appropriate response with Response.Write();.

In your silverlight code, you will just need to request for your page, and you can then read the response from your asp.net page.

Asp.net:

var encyString = Request.QueryString["str"];
//some logic
Response.Write("Success");

Silverlight:

WebClient client = new WebClient(); 
client.DownloadStringCompleted +=
    new DownloadStringCompletedEventHandler(
    client_DownloadStringCompleted);

In Button1_Click, I call DownloadStringAsync, passing the complete URL that includes the number specified by the user.

private void Button1_Click(object sender, RoutedEventArgs e)
{
    string encryptedString = "example";
    client.DownloadStringAsync
      (new Uri("http://testsite.com/mypage.aspx?"+encryptedString));
}

In the DownloadStringCompleted event-handler, I check that the Error property of the event args is null, and either output the response or the error message to the text block.

void client_DownloadStringCompleted(object sender,
  DownloadStringCompletedEventArgs e)
{
    if (e.Error == null)
        resultBlock.Text = "Using WebClient: "+  e.Result;
        //will be Response.Write();

    else
        resultBlock.Text = e.Error.Message;
}

Above code was plagiarized from this blog.

Remember, a sniffer can read your request. You may want to use SSL if you need better security. Possibly a more secure way to send this data would be to POST it to your asp.net page.

This article describes how to POST from silverlight to a page.

HTH