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I just need help with an ASP.net code for redirecting to an error page if the...

I just need help with an ASP.net code for redirecting to an error page if the user hasn't clicked the validation button.

Here is the code I have currently:

protected void Page_Load(object sender, EventArgs e)
    {

    }

protected void btnValidate1_Click(object sender, EventArgs e)
    {

// USER MUST CLICK THIS BUTTON FIRST TO SHOW AN OUTPUT FOR THE ibnInvoice_Click (image button).

// IF USER HASN'T CLICKED THIS YET AND THEY CLICKED THE ibnInvoice_Click (image button), IT MUST BE REDIRECTED TO AN ERROR PAGE

    }

protected void ibnInvoice_Click(object sender, ImageClickEventArgs e)
    { // WHAT SHOULD MY IF STATEMENT BE? INSERT CODE HERE PLS. HERE IS THE CODE I HAVE THAT DOESN'T WORK:

        if(!btnValidate1)

        { // OUTPUT IF btnValidate1 IS CLICKED
            mvwMain.SetActiveView(viwInvoice);

            ibnInvoice.ImageUrl = "images/oeInvoiceSelected.png";
            ibnOrderInfo.ImageUrl = "images/oeOrderInfo.png";
            ibnBillingDetails.ImageUrl = "images/oeBillingDetails.png";

        }
          else

          {
            Response.Redirect("http://www.thatlink.com/Classes/Public/Error.aspx"); // ERROR PAGE REDIRECTION
          }
    }

engineering   Computer-Science   
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Homework Answers

Answer #1

Dear Student ,

As per the requirement submitted above , kindly find the below solution.

Here a new Web Application in asp.net with C# is created using Visual Studio 2017 with name "ASPNETWebApplication".This application contains a web page with name "Default.aspx".Below are the details of this page.

NOTE :INITIALLY ON THE PAGE HIDE THE INVOICE BUTTON AND ON BUTTON CLICK OF THE VALIDATE BUTTON SET VISIBILITY PROPERTY OF BUTTON TO TRUE, THIS MEANS SHOW THE BUTTON.

Default.aspx :

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ASPNETWebApplication.Default" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:Button ID="btnValidate1" runat="server" Text="Validate" OnClick="btnValidate1_Click" />
  
<br />
<br />
<br />
  
<asp:Button ID="ibnInvoice" runat="server" Text="Invoice" OnClick="ibnInvoice_Click" />
<br />
<br />
<br />
<asp:Label ID="lblHeader" runat="server" Text=""></asp:Label>
</form>
</body>
</html>

************************

Default.aspx.cs :

//namespace
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
//application namespace
namespace ASPNETWebApplication
{
public partial class Default : System.Web.UI.Page
{

//page load
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)//if page is loading for first time
{
ibnInvoice.Visible = false;//hide invoice button
}
}

protected void btnValidate1_Click(object sender, EventArgs e)
{
lblHeader.Text = "Validate button clicked";//set message
//when validation button clicked show invoice button
ibnInvoice.Visible = true;
}

protected void ibnInvoice_Click(object sender, EventArgs e)
{
// OUTPUT IF btnValidate1 IS CLICKED
//mvwMain.SetActiveView(viwInvoice);
//ibnInvoice.ImageUrl = "images/oeInvoiceSelected.png";
//ibnOrderInfo.ImageUrl = "images/oeOrderInfo.png";
//ibnBillingDetails.ImageUrl = "images/oeBillingDetails.png";
//display message
lblHeader.Text = "Validation done";

}
}
}

======================================================

Output : Run application using F5 and will get the screen as shown below

Screen 1 :Default.aspx

Screen 2 :Screen when validation button is clicked

Screen 3:Screen when invoice button is clicked

NOTE : PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.

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