How to get CheckBox value from GridView when CheckBox selected

Question

I have GridView filled automatically as

<asp:GridView ID="gvValues" runat="server" 
    OnRowDataBound="gvValues_RowDataBound" 
    OnPageIndexChanging="gvValues_PageIndexChanging" 
    <Columns>           
        <asp:TemplateField HeaderText="#">
            <ItemTemplate>
                <%# gvValues.PageSize*gvValues.PageIndex+ Container.DisplayIndex+1  %> 
                <asp:CheckBox ID="chkProduct" runat="server" CssClass="chkProduct"/>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField  HeaderText="online" meta:resourcekey="Online">
            <ItemTemplate > 
                <asp:CheckBox ID="chkProductonline" runat="server"  OnCheckedChanged ="chkProductonline_CheckedChanged" AutoPostBack="true"/>
            </ItemTemplate>
        </asp:TemplateField>

What I need is when I click on the chkProductonline checkbox, to fire an event and get the chkProductonline and chkProducton values. I have tried this but it always gives me null.

protected void chkProductonline_CheckedChanged(object sender, EventArgs e)
{
    var chkProductonline = FindControl("chkProductonline") as CheckBox;
    // bool ischeck = chkProductonline.Checked;

    var chkProduct = gvValues.FindControl("chkProduct") as CheckBox;
}

I can't loop the GridView. I need to do this one-by-one. Is there another way to do that?

Martin Parenteau · Accepted Answer · 2016-04-05 18:16:24Z

1

You can try this:

protected void chkProductonline_CheckedChanged(object sender, EventArgs e)
{
    CheckBox chkProductonline = sender as CheckBox;
    ...

    CheckBox chkProduct = chkProductionLine.NamingContainer.FindControl("chkProduct") as CheckBox;
    ...
}

answered Apr 5, 2016 at 18:16

Martin Parenteau

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Comments

j.f. · Accepted Answer · 2016-04-05 18:26:41Z

0

You need to call FindControl on a specific row. You will not be able to call it on the entire GridView because there exists repeating content (i.e. multiple chkProductionlines and chkProducts). A row knows of its checkboxes, and not of the others.

So what you can do is first get the CheckBox that called the event (your sender parameter, chkProductionline) and use its NamingContainer. Since it is contained in a GridView row, cast the row as such as use it to find the other controls you may need.

protected void chkProductonline_CheckedChanged(object sender, EventArgs e)
{
    CheckBox chkProductionline = (CheckBox)sender;
    GridViewRow row = (GridViewRow)chkProductionline.NamingContainer;

    CheckBox chkProduct = (CheckBox)row.FindControl("chkProduct");
}

edited Apr 5, 2016 at 18:26

answered Apr 5, 2016 at 18:17

j.f.

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