How to pass data from Silverlight OOB application to asp.net website?

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..

Is it your own web page that the credentials are being submitted to? If so, what does the web page give you? Why don't you use a WCF service instead? Or are you submitting to a third party web site (in which case they should already have a spec on how you should do it)? — slugster, Jul 12 '11 at 23:50

gideon · Accepted Answer · 2011-07-13T05:36:32.633

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

Hello @giddy Is it possible in SL OOB application which runs from client PC to website page.. I passed parameter as a query string from Out of browser application to default.aspx page.. ? — Abhishek B., Jul 12 '11 at 05:59
If I'm not mistaken, you can request from a OOB SL app if this app was installed from the same domain. (Ex: the App was installed from testapp.com) If it was installed from another domain, then you will have to include a *clientaccesspolicy.xml* file on the root of testapp.com so your SL app can access it. [See this page](http://msdn.microsoft.com/en-us/library/cc645032(v=vs.95).aspx) There are numerous default examples of _clientaccesspolicy.xml_ you can find if you google it. — gideon, Jul 12 '11 at 06:48
Thanks a lot for good suggestion. My application runs Out of browser (on client machine ) then I enter user-name and password into application and passes with query string in encrypted format like this url: http://www.testsite.com/mypage.aspx? — Abhishek B., Jul 14 '11 at 04:40

score 1 · Answer 2 · answered Jul 12 '11 at 06:01

1

What I understood from the question is that you are authenticating user twice – First in SL app and then in ASP.Net app. Instead can you just authenticate user in SL and pass the result (True/False or token may be) to ASP.Net app? This is the safe way I feel.

answered Jul 12 '11 at 06:01

Nilesh

81
1
10

So How to communicate with SQL server and check Is it authorized or not. – Abhishek B. Jul 12 '11 at 06:05
I not authenticate user twice. just I check user authenticate from page only.. I not know how to authenticate user from SL with sql server. – Abhishek B. Jul 12 '11 at 06:05
See this video - [link](http://www.silverlight.net/learn/videos/all/use-aspnet-authentication-silverlight-3/). It is for SL3 but should work for SL4. What you are looking for is complex, so you need to understand authentication process well. – Nilesh Jul 12 '11 at 07:29

score 0 · Answer 3 · answered Jul 12 '11 at 05:34

0

You can use like HtmlPage.Window.Eval("window.location.href='"+ YOURURL +"'");

answered Jul 12 '11 at 05:34

Priyan R

1,042
1
15
24

@Priyan_R I want to pass username and password from SL application to new webpage with encrypted query string to url – Abhishek B. Jul 12 '11 at 05:38
Pass the Url Querystring encrypted from silverlight using cryptography checkout http://scrypt.codeplex.com/ – Priyan R Jul 12 '11 at 05:50

How to pass data from Silverlight OOB application to asp.net website?

3 Answers3