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One potential problem with the query string is that some characters aren t allowed in a URL In fact, the list of characters that are allowed in a URL is much shorter than the list of allowed characters in an HTML document All characters must be alphanumeric or one of a small set of special characters (including $-_+!*'(),) Some browsers tolerate certain additional special characters (Internet Explorer is notoriously lax), but many do not Furthermore, some characters have special meaning For example, the ampersand (&) is used to separate multiple query string parameters, the plus sign (+) is an alternate way to represent a space, and the number sign (#) is used to point to a specific bookmark in a web page If you try to send query string values that include any of these characters, you ll lose some of your data.

The previous example uses a data binding expression to set static text information inside a label tag. However, you can also use single-value data binding to set other types of information on your page, including control properties. To do this, you simply have to know where to put the data binding expression in the web page markup. For example, consider the following page, which defines a variable named URL and uses it to point to a picture in the application directory: Public Partial Class DataBindingUrl Inherits System.Web.UI.Page Protected URL As String Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As EventArgs) Handles Me.Load URL = "Images/picture.jpg" Me.DataBind() End Sub End Class You can now use this URL to create a label, as shown here: <asp:Label id="lblDynamic" runat="server"><%# URL %></asp:Label> You can also use it for a check box caption: <asp:CheckBox id="chkDynamic" Text="<%# URL %>" runat="server" /> or you can use it for a target for a hyperlink: <asp:Hyperlink id="lnkDynamic" Text="Click here!" NavigateUrl="<%# URL %>" runat="server" />

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You can test this with the previous example by adding items with special characters in the list box To avoid potential problems, it s a good idea to perform URL encoding on text values before you place them in the query string With URL encoding, special characters are replaced by escaped character sequences starting with the percent sign (%), followed by a two-digit hexadecimal representation For example, the & character becomes %26 The only exception is the space character, which can be represented as the character sequence %20 or the + sign To perform URL encoding, you use the UrlEncode() and UrlDecode() methods of the HttpServerUtility class As you learned in 5, an HttpServerUtility object is made available to your code in every web form through the PageServer property.

You can even use it for a picture: <asp:Image id="imgDynamic" ImageUrl="<%# URL %>" runat="server" /> The only trick is that you need to edit these control tags manually. Figure 16-4 shows what a page that uses all these elements would look like.

SoapClient::__getLastRequest()

The following code uses the UrlEncode() method to rewrite the previous example, so it works with product names that contain special characters: string url = "QueryStringRecipientaspx "; url += "Item=" + ServerUrlEncode(lstItemsSelectedItemText) + "&"; url += "Mode=" + chkDetailsCheckedToString(); ResponseRedirect(url); Notice that it s important not to encode everything In this example, you can t encode the & character that joins the two query string values, because it truly is a special character You can use the UrlDecode() method to return a URL-encoded string to its initial value However, you don t need to take this step with the query string That s because ASPNET automatically decodes your values when you access them through the RequestQueryString collection (Many people still make the mistake of decoding the query string values a second time.

Figure 16-4. Multiple ways to bind the same data To examine this example in more detail, try the sample code for this chapter.

Usually, decoding already decoded data won t cause a problem The only exception is if you have a value that includes the + sign In this case, using UrlDecode() will convert the + sign to a space, which isn t what you want).

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