Question

ASP.NET Checkbox problem - Maybe related to post back?

Asked by: sarniscool

I have this simple program that will get data out of the database and populate a Gridview.  Each row has a checkbox and data from the database.  Now when you check of the check box and click the submit button it is suppose to tell me the rows in which the checkbox of that row is checked but it always return all of them.  Why is it doing that?  I am thinking it might be a postback issue?  Here is the code to the CS and ASPX page.

CS
------------

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;
using System.Data.SqlClient;

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //GridView1
        //Application["pictureFilePath"] + "exterior/"
        temp();
    }

    protected void temp()
    {
        SqlConnection myConnection = new SqlConnection();
        myConnection.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

        SqlCommand myCommand = new SqlCommand("select bathid, model, size, sink, fixture, pic_sm from tblbathroom", myConnection);
        myCommand.Connection.Open();

        SqlDataAdapter da = new SqlDataAdapter(myCommand.CommandText, myConnection);
        DataSet ds = new DataSet();
        da.Fill(ds);


        //close connection
        myConnection.Close();
        da.Dispose();

        this.GridView1.DataSource = ds;
        this.GridView1.DataBind();
    }


    protected void Button1_Click(object sender, EventArgs e)
    {
        CheckBox chkBox = null;

        for (int i = 0; i < this.GridView1.Rows.Count; ++i)
        {
            chkBox = (CheckBox)this.GridView1.Rows[i].FindControl("CheckBox1");

            if (chkBox.Checked)
                TextBox1.Text = TextBox1.Text + i;

        }
    }
}


ASPX
--------------
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="test" %>

<!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>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        &nbsp;&nbsp;&nbsp;
        <asp:GridView ID="GridView1" runat="server" >
            <Columns>
                <asp:TemplateField HeaderText="select">
                <ItemTemplate>
                    <asp:CheckBox ID="CheckBox1" runat = "server" />
                </ItemTemplate></asp:TemplateField>
            </Columns>
        </asp:GridView>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /></div>
    </form>
</body>
</html>

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Asked On
2007-07-10 at 13:42:43ID22687205
Tags

checkbox

,

postback

Topics

C# Programming Language

,

.NET

,

Programming for ASP.NET

Participating Experts
2
Points
0
Comments
5

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Answers

 

by: chinu1310Posted on 2007-07-10 at 14:08:16ID: 19457791

Hi,

You can do it with the itemcommand of the gridview. Check if that works.

 

by: sarniscoolPosted on 2007-07-10 at 15:03:43ID: 19458225

How does that work?  Any good tutorials or tips?  I greatly appreciate it.

 

by: sarniscoolPosted on 2007-07-10 at 15:56:35ID: 19458541

The problem is that I kept overwriting your grid data with every post back.  Change your Page_Load to:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        temp();
    }
}

Problem solved.
 

 

by: Vee_ModPosted on 2007-07-17 at 08:32:08ID: 19505850

Closed, 125 points refunded.
Vee_Mod
Community Support Moderator

20120131-EE-VQP-002

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