Beginning ASP.NET 4.5 in CSharp and VB Opsylum

280 x CHAPTER 7 NAVIGATION
object provide you with information about the server the page is running on. You can use it to get
information about the server name, its IP address, and so on. One of its methods is Transfer, which
performs a server-side transfer.
You can use Server.Transfer only to redirect to other pages within your site. You cannot use it to
send the user to pages on different domains. If you try to do so, the ASP.NET run time throws an
error.
To see the difference between Response.Redirect and Server.Transfer, the following exercise
shows you how to change the page Source.aspx to perform a Server.Transfer operation.
TRY IT OUT
Server-Side Redirecting
It’s easy to change the redirect code so it transfers the user to another page. All you need to do is
replace Response.Redirect with Server.Transfer as demonstrated in this exercise.
1. Open the Code Behind of Source.aspx and replace the line with Response.Redirect with the
following line:
VB.NET
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
Server.Transfer("Target.aspx?Test=SomeValue")
End Sub
C#
protected void Page_Load(object sender, EventArgs e)
{
Server.Transfer("Target.aspx?Test=SomeValue");
}
2. Save the changes and then press Ctrl+F5 to open Source.aspx in the browser (see Figure 7-13).
FIGURE 7-13
The Label control displays the query string values that were sent from Source.aspx to Target
.aspx, demonstrating the fact that you are really viewing the output of the Target.aspx page.
However, the browser’s address bar is left unmodified and still shows Source.aspx, hiding the
new page name and query string values from the user.