The state of the checkbox in the gridview is always unchecked

Question

0.00/5 (No votes)

See more:

I have the following HTML Page with the checkbox "chkZiel" in the gridview "dgZiel":

ASP.NET

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="CC_SimpleTargetReport.aspx.cs" Inherits="CCMatrixDB_WEB.REPORT.CC_SimpleTargetReport" %>

<%@ Register Assembly="Microsoft.ReportViewer.WebForms, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" Namespace="Microsoft.Reporting.WebForms" TagPrefix="rsweb" %>

<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
    <script src="Scripts/jquery-1.10.2.min.js"></script>
    <script src="Scripts/JavaSript_scroll.js"></script>
    <asp:Table ID="Table1" runat="server" Width="100%">
        <asp:TableRow ID="TableRow1" runat="server">
            <asp:TableCell ID="TableCell1" runat="server" HorizontalAlign="Left">
                <asp:TextBox ID="tbCOL1" runat="server" BorderWidth="0" BorderStyle="None" Text="TARGET" Width="100"></asp:TextBox>
            </asp:TableCell>
            <asp:TableCell ID="TableCell2" runat="server" HorizontalAlign="Left">
                <asp:TextBox ID="tbCOL2" runat="server" BorderWidth="0" BorderStyle="None" Text="COMPONENT" Width="100"></asp:TextBox>
            </asp:TableCell>
        </asp:TableRow>
        <asp:TableRow ID="TableRow2" runat="server">
            <asp:TableCell ID="TableCell3" runat="server" HorizontalAlign="Left">
                <DIV style=" border-style: double; OVERFLOW: auto; WIDTH: 550px; HEIGHT: 168px"> 
                    <asp:GridView ID="dgZiel" runat="server" BackColor="White" 
                        CellPadding="4" GridLines="Horizontal" AutoGenerateColumns="false" ShowHeader="False">
                        <Columns>
                            <asp:TemplateField ItemStyle-HorizontalAlign="Center" >
                                <ItemTemplate>
                                    <asp:CheckBox ID="chkZiel" runat="server"  Width="40px" />
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:BoundField DataField="Name" ItemStyle-Width="100%" />
                        </Columns>
                    </asp:GridView>
                </div>
            </asp:TableCell>
        </asp:TableRow>
		<asp:TableRow ID="TableRow3" runat="server">
            <asp:TableCell ID="TableCell5" runat="server" HorizontalAlign="Left" ColumnSpan="2" VerticalAlign="Bottom" Height="45px">
                <asp:Button ID="Button" runat="server" Text="GENERATE REPORT" Width="142px" onclick="Button_Click" />
            </asp:TableCell>
        </asp:TableRow>
    </asp:Table>
</asp:Content>

The following code checks the state of the checkbox for all gridview rows:

C#

    protected void Button_Click(object sender, EventArgs e)
    {
        for (int i = 0; i < dgZiel.Rows.Count; i++)
        {
            CheckBox chkZiel = (CheckBox) dgZiel.Rows[i].FindControl("chkZiel");
            if (chkZiel.Checked == true)
            {
                string name = dgZiel.Rows[i].Cells[1].Text;
            }
        }
}

But the state of all checkboxes are uncheced (chkZiel.Checked -> false) equal if the checkbox is checked or not.
What is wrong?

What I have tried:

I tried different c# codes, but the state of the checkbox stays always on unchecked.

Posted 20-Jun-16 3:24am

TuerelF

Updated 20-Jun-16 4:12am

Add a Solution

Comments

Kornfeld Eliyahu Peter 20-Jun-16 9:28am

You button click initiates a full post back of the page...All controls initialized to their original state (unchecked for check-box)...
Go and learn about partial post back - AJAX...

Karthik_Mahalingam 20-Jun-16 9:30am

post your databind code

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

TuerelF · Answer 1 · 2016-06-20T04:09:00

Solution 1

Thank you wery much. I forget the:
if (!this.IsPostBack)
statement in the Page_Load() function.

Posted 20-Jun-16 4:09am

TuerelF

Comments

Vincent Maverick Durano 21-Jun-16 14:45pm

That's what I've said. :) Glad it works for you now :)

Vincent Maverick Durano · Answer 2 · 2016-06-20T04:12:00

This will typically happen if you are not binding your GridView within Not Ispostack block. If you are binding your Grid on page load then make sure to wrap it within Not Ispostback. For example:

C#

protected void Page_Load(object sender, EventArgs e){
        if (!IsPostBack)
        {
            // Populate your grid here and call DataBind()
           
        }
}

This will ensure that the state of your CheckBox will not reset on postbacks.