What is wrong with my cross page post back ?

Tangara G

Hi,

I tried out this cross page post back to understand the concept but it doesn't give me anything on the 2nd page. Hope someone can tell me what went wrong with my code. Tks.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="hiddenfieldtest.WebForm1" %>
"http://www.w3.org/1999/xhtml">
"server">
Cross Page Postback Example in asp.net
"form1" runat="server">
Enter UserName: "txtUserName" runat="server"/>
Enter Location: "txtLocation" runat="server"/>
"btnPostback" Text="Postback" runat="server" PostBackUrl="~/WebForm2.aspx" />

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="hiddenfieldtest.WebForm2" %>
"http://www.w3.org/1999/xhtml">
"server">
"form1" runat="server">
WebForm2.aspx Page
"lblName" runat="server" />
"lblLocation" runat="server" />

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace hiddenfieldtest
{
public partial class WebForm2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (PreviousPage != null && PreviousPage.IsCrossPagePostBack)
{
TextBox txtName = (TextBox)PreviousPage.FindControl("txtUserName");
TextBox txtLocation = (TextBox)PreviousPage.FindControl("txtLocation");
lblName.InnerText = "Welcome to WebForm2.aspx page " + txtName.Text;
lblLocation.InnerText = "Your Location: " + txtLocation.Text;
}
else
{
Response.Redirect("WebForm1.aspx");
}
}
}
}

9 Replies

Know the answer? Post it — somebody with the same question will find it here.

Dilip Gupta9y ago
have you remove postbackurl from

"btnPostback" Text="Postback" runat="server" PostBackUrl="~/WebForm2.aspx" />

then write
protected void btnPostback_Click(object sender, EventArgs e)
{
Server.Transfer("~/WebForm2.aspx");
}
in webform1.aspx.cs
0
Tangara G9y ago
Prakash,

That is what I did. And then I showed you guys the error. So, why asked me to do the same thing again ?
0
Tangara G9y ago
Hi Dilip,

I got this error following your advice

Error 1 The type 'hiddenfieldtest.WebForm1' already contains a definition for 'btnPostback' c:\users\karen goh seow hui\documents\visual studio 2013\Projects\hiddenfieldtest\hiddenfieldtest\WebForm1.aspx.designer.cs 49 60 hiddenfieldtest
0
Midhun Tp9y ago
Hi,

Is there any codes in the page load of Webform1.aspx.cs?

Also try commenting below lines in Webform2.aspx.cs and run and check what is happening -

else
{
Response.Redirect("WebForm1.aspx");
}
0
Prakash Kumar9y ago
Hi Tangara,
In your code PostBackUrl is not working properly instead of check
protected void Button1_Click(object sender, EventArgs e)
{
            Server.Transfer("~/WebForm2.aspx");
}
in button click event. hope it will works
0
Dilip Gupta9y ago
write Server.Transfer("~/WebForm2.aspx"); on btnPostback click event
0
Tangara G9y ago
Hi Midhun,

There is no error except that the page does not go to WebForm2 which it is supposed to be like that .

So, after I hit enter, the infor I entered into the textbox is gone and the url remains.

http://localhost:2294/WebForm1
0
Midhun Tp9y ago
Hi,

Your code is working fine. Have you tried debugging your code?

Are you getting any error?
0
Dilip Gupta9y ago
Reffere this

http://csharp-video-tutorials.blogspot.in/2012/11/cross-page-posting-in-aspnet-part-55.html

http://csharp-video-tutorials.blogspot.in/2012/11/cross-page-postback-strongly-typed.html
0

Enter UserName:	"txtUserName" runat="server"/>
Enter Location:	"txtLocation" runat="server"/>
	"btnPostback" Text="Postback" runat="server" PostBackUrl="~/WebForm2.aspx" />