Post to Another Page problem

Indo77 · November 9th, 2006, 07:11 AM

Hi Everyone, I wonder if anyone can help me with this problem. I have set up a page called "Default.aspx" that contains a search text box called txtName and a button. I want to post the results of the text search on a another page called searchResults. The results are based on a search by potential students for courses. However when I try to access the page I get an error thrown up as such.

Could not find control 'txtName' in ControlParameter 'Course'.

The page will work perfectly if I post it back to itself but when I post to another page the above error appears. This leads me to suspect that the page is not remembering a value for txtName on the previous. I have tried various incarnations of retrieving the textbox value but to no avail.
I have imported

Code:

<%@ PreviousPageType VirtualPath="~/Default.aspx" %>

and used it with

Code:

    public void Page_Load(object sender, EventArgs e)
    {

        if (PreviousPage != null && PreviousPage.IsCrossPagePostBack)
        {
           TextBox txtName = (TextBox)Page.PreviousPage.FindControl("txtName");
           GridView1.Visible = true;
        }


    }

Nothing seems to work and this one error has gridlocked me at work for 2 days now. Anyways here is a full listing of the code.

default.aspx

Code:

<%@ Register TagPrefix="BIE" TagName="header" Src="header.ascx" %>
<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <link rel="stylesheet" href="stylecss.css" type="text/css" media="screen">
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:TextBox ID="txtName" runat="server" AccessKey="4"></asp:TextBox>
<asp:Button ID="btnSearch" runat="server" Text="Go" PostBackUrl="searchResults.aspx"/>
        <table style="width: 100%" height="100%" >
            <tr>
                <td colspan="2">
                <BIE:HEADER id="header1" Runat="server"></BIE:HEADER>
                </td>
            </tr>
            <tr>
                <td colspan="2">

                </td>
            </tr>

            <tr>
                <td colspan="2">
                </td>
            </tr>
        </table>

    </div>
    </form>
</body>
</html>

searchResults.aspx

Code:

<%@ Import Namespace="System.Data.OleDb" %>
<%@ Import Namespace="System.Configuration" %>
<%@ Import Namespace="System.Data" %>
<%@ Page Language="C#" EnableEventValidation="False" %>
<%@ PreviousPageType VirtualPath="~/default.aspx" %>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
  
    public void Page_Load(object sender, EventArgs e)
    {

        if (PreviousPage != null && PreviousPage.IsCrossPagePostBack)
        {
           TextBox txtName = (TextBox)Page.PreviousPage.FindControl("txtName");
           GridView1.Visible = true;
        }


    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
    <asp:AccessDataSource ID="AccessDataSource1" runat="server" DataFile="<%$ connectionStrings: connString %>"

            SelectCommand="SELECT [Course_ID], [Course], [Mode] FROM [Courses] WHERE [Course] LIKE '%' + @Course + '%'">

            <SelectParameters>

                <asp:ControlParameter ControlID="txtName" Name="Course" PropertyName="Text" Type="String" />

            </SelectParameters>

        </asp:AccessDataSource>
            <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
                DataKeyNames="Course" DataSourceID="AccessDataSource1" CssClass="courselist64">
                <Columns>
                <asp:HyperLinkField DataTextField="Course" DataNavigateUrlFields="Course_ID" DataNavigateUrlFormatString="Results.aspx?CourseID={0}" HeaderStyle-CssClass="courselist64" >
                  </asp:HyperLinkField>                                
                    <asp:BoundField DataField="Mode" HeaderText="Mode" SortExpression="Mode"/>
                </Columns>
            </asp:GridView>
    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    </form>
</body>
</html>

I would appreciate any ideas. Thanks

Indo77 · November 9th, 2006, 12:11 PM

Never worry I found a solution to the problem. I dumped the PreviousPage dierctives after nothing would work. Instead I set up a querystring on the first page,

    public void btnSearch_Click(object sender, EventArgs e)
    {
        Response.Redirect("searchResults.aspx?Name=" + txtName.Text);
    }

Then on the second page assigned a label value to the querystring

  public void Page_Load(object sender, System.EventArgs e)
    {
        if (Request.QueryString["Name"] != null)
        {
            Label1.Text = Request.QueryString["Name"];
            GridView1.Visible = true;
        }

    }

I was then able to assign the Label1 id as the controlID for my ControlParameter.

<asp:ControlParameter ControlID="label1" Name="Course" PropertyName="Text" Type="String" />

zhuhhu · March 8th, 2007, 05:31 PM

Still has problem.

If I use label <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
then I get search result : any words match "label". for example: Labelle, Shirley ; Avery, Laquita Labelle ;....
Please Help.
Thanks.