Is there a way to clear the QueryString before PostBack?

[wey97]

I have a somewhat difficult problem...

The project I have is complicated so I made a simpler example to explain.

I have WebForm1.aspx with a Hyperlink control (Hyperlink1) and a Button control (Button1)

The Hyperlink NavigateURL is WebForm1.aspx?id=0

and the Page_Load and Button1_Click events are:

private void Page_Load(object sender, System.EventArgs e)
{
	if(Request.QueryString["id"] != null)
	{
		Response.Write(Request.QueryString["id"].ToString() + "<BR>");
	}
	else // do something else
	{
		Response.Write("id is null<BR>");
	}
}

private void Button1_Click(object sender, System.EventArgs e)
{
	Page.RegisterClientScriptBlock("", "<script>alert('Button1 Click');</script>");
	Response.Redirect("WebForm1.aspx");
}

Now, if I click the Hyperlink, I'm redirected back to the same page and the QueryString is shown in the Address Bar - http://localhost/QueryString/WebForm1.aspx?id=0

and 0 is output at the top of the page.

Next, I want to click Button1 but when the page reposts I want the QueryString variable "id" to be null or just be something different. The only way I could find to clear it is to just Redirect back to the page itself.

The problem with that is, the code before the redirect won't show up on the page and any code after the redirect won't execute at all. If I comment out the Redirect line, the code executes, but the QueryString variable is still set.

[Memnoch1207]

Try something like this

If Page.IsPostBack Then
   Request.QueryString("id") = ""
End If

[wey97]

Originally posted by Memnoch1207
Try something like this

If Page.IsPostBack Then
   Request.QueryString("id") = ""
End If

I tried something similar but apparently the QueryString vars are Read-Only

[mendhak]

If Page.IsPostBack Then
'Don't read the querystring!
Else
'whatever else...
End If

No?

[wey97]

That works. I forgot IsPostBack would be reset on the link click even when the page is redirecting back to itself.