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How to submit a page to another page in asp.net

// Example.aspx //


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Example.aspx.cs" Inherits="_Example" %>  
  
<!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>PostBackUrl Example: how to submit a page to another page in asp.net</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <asp:Label ID="Label1" runat="server" Font-Size="Large" ForeColor="DarkSlateBlue"></asp:Label>  
        <br />  
        <asp:Label ID="Label2" runat="server" Text="Your City" AssociatedControlID="TextBox1"></asp:Label>  
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>  
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1" Text="*"></asp:RequiredFieldValidator>  
        <br />  
        <asp:Button ID="Button1" runat="server" Text="Submit in this page" OnClick="Button1_Click" />  
        <asp:Button ID="Button2" runat="server" Text="Submit in city page" PostBackUrl="~/CityPage.aspx" />  
    </div>  
    </form>  
</body>  
</html>  


// Example.aspx.cs //

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;

public partial class Example : System.Web.UI.Page
{

  protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void Button1_Click(object sender, System.EventArgs e)
 {  
        Label1.Text = "Your city name: " +  
            TextBox1.Text.ToString();  
    }  

}


// city.aspx //


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="city.aspx.cs" Inherits="_city" %>  
  
<!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>City Page</title>  
</head>  
<body>  
    <form id="form1" runat="server">  
    <div>  
        <h1>City Page</h1>  
        <asp:Label ID="Label1" runat="server" Font-Size="Large" ForeColor="Crimson"></asp:Label>  
    </div>  
    </form>  
</body>  
</html>  

// city.aspx.cs //

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;

public partial class city: System.Web.UI.Page
{


    protected void Page_Load(object sender, System.EventArgs e) 
{  
        TextBox PP_TextBox1;  
        PP_TextBox1 = (TextBox)PreviousPage.FindControl("TextBox1");  
        Label1.Text = "Your City: " +   PP_TextBox1.Text;  
    }  

    }  


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