如何从服务器端按钮单击设置 Javascript Cookie (VB.net)

Question

My Problem : I create a server side cookie with a ASP.NET (VB) button click. The cookie gets created but bc there has only been a page PostBack with the button click, the cookie is not yet recognized by the server side page load code. It will take a page reload (not just a post-back) for the server side cookie to be recognized.

My Proposed Solution: Create a client side cookie with JavaScript and a server side cookie with VB.net when the ASP.NET button click.

Private Sub btnTest_Click(sender As Object, e As EventArgs) Handles btnTest.Click
 If lblTest.text = "Yes" then

  '1st create client side JavaScript cookie

  '2nd create server side cookie
  Dim bCookie As New HttpCookie("promo")
  bCookie.Value = "samplerpromobox"
  bCookie.Expires = DateTime.Now.AddDays(7)
  Response.Cookies.Add(bCookie)

 End If
End Sub

Questions:

1. How do I create the client side JavaScript cookie with an ASP.NET (VB) button click?
2. How do I request the client side cookie from the server side page load on PostBack ?

All help with this is greatly appreciated.

Answer 1

I ended up fixing this issue but not by using my proposed solution. I instead used the page's PreRender instead of the page's Page_Load to test for the existence of the just created cookie. Apparently the cookies (and some controls) are not immediately available during the the Page_Load but are available (and all controls) during PreRender.