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Gridview search using form or querystring parameter

Posted on 2008-10-23
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Last Modified: 2012-08-13
Hi,

I have a simple gridview on a page which is populated with a query that has a parameter in it.  Here's the query.

SELECT     db_key, email_address, company_name, date_entered, valid_email
FROM         dbo.tbl_Email2
WHERE     (email_address LIKE '%' + @email + '%')

I have a text box called searchTextBox on the same web page as the gridview. There is also a regular button.  I want the user to be able to enter a search string, click search and see the filtered results.

<asp:TextBox ID="searchTextBox" runat="server"></asp:TextBox>
    <asp:Button ID="Button1" runat="server" Text="Search" />

If I use the querystring parameter and type the url with a query parameter, it works fine.  But if I use the form parameter it doesn't return any records.

 <asp:FormParameter FormField="searchTextBox" Name="email" Type="string" />

I thought that postback was enabled by default.  Am I missing something?

Thanks,
Bonnie
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Question by:Bonnie_K
  • 3
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6 Comments
 
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Assisted Solution

by:mkosbie
mkosbie earned 500 total points
ID: 22784888
You need to tell the gridview to re-databind during the postback by handling Button1's Click event.  Not sure of the expected behavior when you provide two values for the same parameter on a datafield (ie a QueryStringParameter AND a FormParameter), but probably would be unpredictable.  Sample VB code below:
Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
    GridView1.DataBind()
End Sub

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Author Comment

by:Bonnie_K
ID: 22785055
mkosbie - I added that and am still not getting any records.  

I am only using one parameter or the other at a time, I removed the FormParameter and tried the QueryStringParameter for testing, then put the FormParameter back in.

    protected void Button1_Click(object sender, EventArgs e)
    {
        GridView1.DataBind();

    }

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LVL 8

Expert Comment

by:mkosbie
ID: 22785340
Just to make sure, in C#, to handle the event, you need to assign event handling on the element level (rather than with a Handles clause).  If you have it set that way already and are still having problems, will you post the code for us to review?
<asp:Button runat="server" ID="Button1" OnClick="Button1_Click" Text="Search" />

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Author Comment

by:Bonnie_K
ID: 22785975
yes, it's there...

<asp:Button ID="Button1" runat="server" Text="Search" OnClick="Button1_Click" />

I will post the page and code.

Now that it is pasted, I think it has to do with the fact that I am using a master page...
<%@ Page Language="C#" MasterPageFile="~/Email_List/MasterPage2.master" AutoEventWireup="true" CodeFile="search.aspx.cs" Inherits="Email_List_search" Title="Search Email List" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<div style="text-align:center">
    <asp:TextBox ID="searchTextBox" runat="server"></asp:TextBox>
    <asp:Button ID="Button1" runat="server" Text="Search" OnClick="Button1_Click" /><br />
    <br />
    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" BackColor="White"
        BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" CellPadding="3" DataKeyNames="db_key"
        DataSourceID="ObjectDataSource1" ForeColor="Black" GridLines="Vertical">
        <FooterStyle BackColor="#CCCCCC" />
        <Columns>
            <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
            <asp:BoundField DataField="email_address" HeaderText="Email Address" SortExpression="email_address" >
                <ItemStyle HorizontalAlign="Left" />
            </asp:BoundField>
            <asp:BoundField DataField="company_name" HeaderText="Company Name" SortExpression="company_name" >
                <ItemStyle HorizontalAlign="Left" />
            </asp:BoundField>
            <asp:BoundField DataField="date_entered" HeaderText="Date Updated" SortExpression="date_entered" />
        </Columns>
        <PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
        <SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" Font-Names="Tahoma" Font-Size="Small" />
        <AlternatingRowStyle BackColor="#CCCCCC" />
        <RowStyle Font-Names="Tahoma" Font-Size="Small" />
    </asp:GridView>
    <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" DeleteMethod="Delete" OldValuesParameterFormatString="original_{0}" SelectMethod="GetEmailbySearch"
        TypeName="DataTableAdapters.tbl_Email_Blast2TableAdapter" UpdateMethod="Update">
        <DeleteParameters>
            <asp:Parameter Name="Original_db_key" Type="Int32" />
        </DeleteParameters>
        <UpdateParameters>
            <asp:Parameter Name="email_address" Type="String" />
            <asp:Parameter Name="company_name" Type="String" />
            <asp:Parameter Name="date_entered" Type="DateTime" />
            <asp:Parameter Name="valid_email" Type="String" />
            <asp:Parameter Name="Original_db_key" Type="Int32" />
        </UpdateParameters>
        <SelectParameters>
        
            <asp:QueryStringParameter QueryStringField="test" Name="email" Type="string" />
            
        </SelectParameters>
    </asp:ObjectDataSource>
 
 
 
</div>
</asp:Content>
 
 
---------Code-------------
 
 
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
 
public partial class Email_List_search : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
 
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        GridView1.DataBind();
      
    }
}

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Accepted Solution

by:
Bonnie_K earned 0 total points
ID: 22786043
Oops, in the previous post it had the wrong query parameter.  I did test it with

            <asp:FormParameter FormField="searchTextBox" Name="email" Type="string" />

and it still didn't work

I just removed the master page and changed it to an independant page and now it works.

Why won't is work with a master page?

0
 

Expert Comment

by:IntercareSupport
ID: 23205961
Did this work for you?  I can't translate what was in this posting to my problem.

http://www.experts-exchange.com/Programming/Languages/.NET/ASP.NET/Q_23996251.html
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