How to solve this issue in a URL?

Question

How to encrypt and decrypt the Query string and sent,receive to another page?

Page 1

LinkButton InvoiceEdit = sender as LinkButton;
string EditId = InvoiceEdit.CommandArgument.ToString();
Response.Redirect("edit invoice.aspx?EditId=" + EditId);

Page 2

String invoiceId = Request.QueryString["InvoiceId"].ToString();

Answer 1

I guess you wanna change editid but some value NOT-Changed after editid changed. I think you can use viewstate to help.

Answer 2

Sorry I don't know what's your exact issue. But here I should say:

1. Do not put those financial related parameters in the query string.

2. Do you mean that when you change the URL in the browser from xx.aspx?editid=5 to xx.aspx?editid=4, the invoice in your page also changes? The reason is, editid=4 means the invoice you loaded is the one whose id is 4 while editid=5 will display the invoice whose id is 5. If you want to get the same result when browsing editid=4 and editid=5, just make the two invoices same. haha

Answer 3

Your question is not clear. what i understand that seems u want to restrict user to modified url. you can user URL Referrer check on page load if Request.UrlReferrer.AbsoluteUri == null { Response.redirect("home page") }

If someone tried to modify url it will alway return null and you can redirect to home page or some other page to restrict the user.