Asp.Net 2.0 Cross Page Postback

Posted by on February 27, 2010 Leave a comment (0) Go to comments

Introduction:
In article How to Access a function from different Webpages i explained how to access a function from
another webpage under same project/namespace.In this article,we are going to discuss about the cross page postback in ASP.NET 2.0/3.5

Main:
what is cross page postback?,

cross page postback is simply to submit a form on one page (page1.aspx) and retrieve values of controls
of this page on another page (Page2.aspx).

See this below simple ex,

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
 
<asp:Label id="Firstlabel" runat=server/>
 
<asp:Button ID="Submit" runat="server" 
            OnClick="Submit_Click" 
            PostBackUrl="~/Page2.aspx"
            Text="Cross page postback" /><br />
</div>
</form>
</body>
</html>

In Code Behind,

protected void Page_Load(object sender, EventArgs e)
{
    if (PreviousPage != null && PreviousPage.IsCrossPagePostBack)
    {
      Label local_lbl;
      local_lbl.Text = (Label)PreviousPage.FindControl("userid").Text;
    }
}