Trying to pass SelectedValue of dropdown in querystring.

jazzcatone · May 5th, 2009, 01:51 AM

I have a dropdown control and a hyperlink control. Am trying to pass the SelectedValue of the dropdown when the user clicks the hyperlink control. Code is below:

string pid = ddlpartno.SelectedItem.Value;
lnkpartdetail.NavigateUrl = "~/production/pn_detail.aspx?pnpartnumber=" & pid;

Any idea what i need to do. Seems I get Intellisense errors in VS no matter what I try. Any advice would be greatly appreciated.

Imar · May 5th, 2009, 03:38 AM

What error do you get? Often, posting the right error message leads to a quicker solution...

In this case, I can see one thing wrong:

"~/production/pn_detail.aspx?pnpartnumber=" & pid;

In C#, you shouldn't use the ampersand, but a plus:

"~/production/pn_detail.aspx?pnpartnumber=" + pid;

Hope this helps,

Imar

Lee Dumond · May 5th, 2009, 10:51 AM

HTML Code:

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

<!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>Parts</title>
</head>
<body>
   <form id="form1" runat="server">
      <div>
         Part No:
         <asp:DropDownList ID="ddlpartno" runat="server" AutoPostBack="True">
            <asp:ListItem Text="part1" />
            <asp:ListItem Text="part2" />
            <asp:ListItem Text="part3" />
         </asp:DropDownList>
         <p>
            <asp:HyperLink ID="lnkpartdetail" runat="server">Part Details</asp:HyperLink>
         </p>
      </div>
   </form>
</body>
</html>

Code:

using System;

public partial class _Default : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {
      lnkpartdetail.NavigateUrl =
         String.Format(
            "~production/pn_detail.aspx?pnpartnumber={0}",
            ddlpartno.SelectedValue);
   }
}

jazzcatone · May 5th, 2009, 07:05 PM

Thanks. I really appreciate your input.