Forms Data Controls :: Multiple Dropdownlists Not Holding State After Response Redirect?
Nov 11, 2010
I hope somebody can guide me to overcome below challenge.
My form has three dropdownlist controls and one listview. Everything works fine if I don't try to pass multiple querystrings to get different URL on the same page. But challenge comes when I try to pass multiple querystrings to show different URL's for SEO.
Following are the ID's:
1. DropDownList1= Country
2. DropDownList2= State
3. DropDownList3= City
4. Listview1= Resturants (I am not including Code .....yet)
With my code DropDownList1 holds the state and passes the value to URL OK .When I try to select
different value in DropDownList2 or DropDownList3 are able to
pass the vaule to URL but in the form they stay on the first item and doesn't change and so does Listview1.
Here is my code:
<%@ Page Language="C#" AutoEventWireup="true" %>
<%@ Import Namespace="System.Data" %>
<!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">
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (false == IsPostBack)
{
if (Request.QueryString["Brand"]!= null)
{DropDownList1.SelectedValue = Request.QueryString["Country"].ToString();}
if (Request.QueryString["Gender"]!= null)
{DropDownList2.SelectedValue = Request.QueryString["State"].ToString();}
if (Request.QueryString["Category"]!= null)
{DropDownList3.SelectedValue = Request.QueryString["City"].ToString();}
}
}
protected void DropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
Response.Redirect("/resturants.aspx?State=" + DropDownList1.SelectedValue + "&State=" + DropDownList2.SelectedValue + "&City=" + DropDownList3.SelectedValue);
}
</script>
<head></head>
<body><form id="form1" runat="server">
<asp:DropDownList id="DropDownList1" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource2" DataTextField="Country" DataValueField="Country" ForeColor="#808080" OnSelectedIndexChanged="DropDownList_SelectedIndexChanged" >
</asp:DropDownList>
<asp:AccessDataSource ID="AccessDataSource2" runat="server" DataFile="../database.mdb" SelectCommand="SELECT DISTINCT [Country] FROM [Country] ORDER BY [Country]">
</asp:AccessDataSource>
<asp:DropDownList id="DropDownList2" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource3" DataTextField="State" DataValueField="State" ForeColor="#808080" OnSelectedIndexChanged="DropDownList_SelectedIndexChanged" >
</asp:DropDownList>
<asp:AccessDataSource ID="AccessDataSource3" runat="server" DataFile="../database.mdb" SelectCommand="SELECT DISTINCT [State] FROM [table] WHERE ([Restuarant NAME] LIKE '%' + ? + '%')">
<SelectParameters>
<asp:controlparameter ControlID="DropDownList1" Name="Restuarant_NAME]" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:AccessDataSource>
<asp:DropDownList id="DropDownList3" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource4" DataTextField="City" DataValueField="City" ForeColor="#808080" OnSelectedIndexChanged="DropDownList_SelectedIndexChanged" >
</asp:DropDownList>
<asp:AccessDataSource ID="AccessDataSource4" runat="server" DataFile="../database.mdb" SelectCommand="SELECT DISTINCT [City] FROM [table] WHERE (([State] = ?) AND ([Resturant NAME] LIKE '%' + ? + '%'))">
<SelectParameters>
<asp:controlparameter ControlID="DropDownList2" Name="State" PropertyName="SelectedValue" Type="String" />
<asp:controlparameter ControlID="DropDownList1" Name="Resturant_NAME" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:AccessDataSource>
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