inside nested grid view checkbox checked value get

Question

<asp:GridView ID="grdOpen" runat="server" AutoGenerateColumns="false" CssClass="GridView1"

HeaderStyle-BackColor="#108ec0" HeaderStyle-ForeColor="White" DataKeyNames="transactionId"

OnRowDataBound="OnRowDataBound" Width="98%" OnRowCommand="grdOpen_RowCommand">

<Columns>

<asp:TemplateField>

<ItemTemplate>

<img alt="" style="cursor: pointer" src="../images/plus.png" />

<asp:Panel ID="pnlOrders" runat="server" Style="display: none">

<asp:GridView ID="grdOpendetails" runat="server" AutoGenerateColumns="false" CssClass="GridView1"

HeaderStyle-BackColor="#108ec0" HeaderStyle-ForeColor="White" Width="90%">

<Columns>

<asp:TemplateField HeaderText="S No.">

<ItemTemplate>

<%# Container.DataItemIndex +1 %>.

</ItemTemplate>

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />

</asp:TemplateField>

<asp:TemplateField HeaderText="Ordr Date">

<ItemTemplate>

<asp:Label ID="date" Text='<%# Eval("Order Date","{0:dd/MM/yyyy}")%>' runat="server"></asp:Label>

</ItemTemplate>

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />

</asp:TemplateField>

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />

</asp:TemplateField>

<asp:TemplateField HeaderText="Ship">

<ItemTemplate>

<asp:ImageButton ID="lnk_delete" runat="server" CommandName="ship1" CommandArgument='<%# Eval("transactionId") %>'

ImageUrl="~/images/ship_adbtn.png" />

</ItemTemplate>

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />

</asp:TemplateField>

<asp:TemplateField>

<HeaderTemplate>

<asp:CheckBox ID="chkall" runat="server" AutoPostBack="true" OnCheckedChanged="CheckedChanged_chkall" />

</HeaderTemplate>

<ItemTemplate>

<asp:CheckBox ID="chkRow" runat="server" OnCheckedChanged="CheckedChanged_chkRow" />

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField>

</asp:TemplateField>

</Columns>

</asp:GridView>

</asp:Panel>

</ItemTemplate>

</asp:TemplateField>

<asp:TemplateField HeaderText="S No." ItemStyle-Width="50px">

<ItemTemplate>

<%# Container.DataItemIndex +1 %>.

</ItemTemplate>

<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" />

gn="Center" />

</asp:BoundField>

<asp:BoundField ItemStyle-Width="100px" DataField="Total Order" HeaderText="Total Order">

<ItemStyle HorizontalAlign="Center" />

</asp:BoundField>

</Columns>

</asp:GridView>

 

 

code is like:

 

 

protected void CheckedChanged_chkall(object sender, EventArgs e)

{

foreach (GridViewRow grid in grdOpen.Rows)

{

GridView gr = grid.FindControl("grdOpendetails") as GridView;

CheckBox chk = gr.FindControl("chkall") as CheckBox;

if (chk != null && chk.Checked == true)

{

}

}

}

 

 

how to get if header check box checked then how to get all checked value