System.Net.HttpUtility.HtmlEncode not encoding #

I need to encode a url in my WP7 application. The class im using do开发者_StackOverflow社区sent seem to encode # (to %23). Any ideas what im doing wrong?

string foo = InkBunnyUrls.Login + "&username=" + txtUsername.Text + "&password=" + txtPassword.Password;
//foo = https://inkbunny.net/api_login.php?output_mode=xml&username=test&password=foobar#1
string url = System.Net.HttpUtility.HtmlEncode(foo);
// url = https://inkbunny.net/api_login.php?output_mode=xml&username=test&password=foobar#1

Edit: I tried UrlEncode and that dosent work (see below). Reading the msdn doc it wont escape # . I cant use the system.web class as it isnt in WP7

        string foo = InkBunnyUrls.Login + "&username=" + txtUsername.Text + "&password=" + txtPassword.Password;
        //foo = https://inkbunny.net/api_login.php?output_mode=xml&username=test&password=foobar#1
        string url = Uri.EscapeUriString(foo);
        //  https://inkbunny.net/api_login.php?output_mode=xml&username=test&password=foobar#1

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The # symbol doesn't need to be HTML-encoded.

If you're expecting the result to be %23 then you should look at UrlEncode instead:

string encoded = HttpUtility.UrlEncode("#");    // "%23"

EDIT...

Do the WP7 libs support EscapeDataString?

string encoded = Uri.EscapeDataString("#");    // "%23"

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I think you are looking for UrlEncode and not HtmlEncode.