Nested GridView - How to trigger the Child GridView Button Click event

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ASP.NET

Gridview

I need to show a Master/Child data in a page and I have used multiple GridViews to achieve the same. So, I have created two GridViews (Parent & Child) and now I want to fire the Button click event (i.e. btnLock) from the child gridview control and do some DB operations. So, I dont know how to achieve this.

Please help.

<asp:UpdatePanel ID="pnlUpdate" runat="server">
<contenttemplate>
<asp:GridView Width="100%" AllowPaging="True" ID="gvCustomers" AutoGenerateColumns="False"
DataSourceID="sqlDsCustomers" runat="server" ShowHeader="False" OnRowCreated="gvCustomers_RowCreated">
<columns>
<asp:TemplateField>
<itemtemplate>

    <div class="group" id="<%#String.Format("customer{0}",Container.DataItemIndex) %>" önclick="showhide(<%#String.Format("\"#customer{0}\"",Container.DataItemIndex) %>,<%#String.Format("\"#order{0}\"",Container.DataItemIndex) %>)">
        <asp:Image ID="imgCollapsible" CssClass="first" ImageUrl="~/Assets/img/plus.png"
            Style="margin-right: 5px;" runat="server" />
                <%#Eval("CustomerID")%>
                :
                <%#Eval("CompanyName")%>
                (<%#Eval("TotalOrders")%>
                Orders) 
    </div>
    <asp:SqlDataSource ID="sqlDsOrders" runat="server" ConnectionString="<%$ ConnectionStrings:Northwind %>"
        SelectCommand="SELECT [OrderID], [OrderDate], [RequiredDate], [Freight], [ShippedDate] FROM [Orders] WHERE ([CustomerID] = @CustomerID)">
        <SelectParameters>
            <asp:Parameter Name="CustomerID" Type="String" DefaultValue="" />
        </SelectParameters>
    
    <div id="<%#String.Format("order{0}",Container.DataItemIndex) %>" class="order">
        <asp:GridView AutoGenerateColumns="false" CssClass="grid" ID="gvOrders" DataSourceID="sqlDsOrders"
            runat="server" ShowHeader="true" EnableViewState="false">
            <rowstyle cssclass="row" />
            <alternatingrowstyle cssclass="altrow" />
            <columns>
                <asp:TemplateField ItemStyle-CssClass="rownum">
                    <itemtemplate>
                        <%# Container.DataItemIndex + 1 %>
                    </itemtemplate>
                
                <asp:BoundField HeaderText="Order ID" DataField="OrderID" ItemStyle-Width="80px" />
                <asp:BoundField HeaderText="Date Ordered" DataField="OrderDate" DataFormatString="{0:MM/dd/yyyy}"
                    ItemStyle-Width="100px" />
                <asp:BoundField HeaderText="Date Required" DataField="RequiredDate" DataFormatString="{0:MM/dd/yyyy}"
                    ItemStyle-Width="110px" />
                <asp:BoundField HeaderText="Freight" DataField="Freight" DataFormatString="{0:c}"
                    ItemStyle-Width="50px" ItemStyle-HorizontalAlign="Right" />
                <asp:BoundField HeaderText="Date Shipped" DataField="ShippedDate" DataFormatString="{0:MM/dd/yyyy}"
                    ItemStyle-Width="100px" />
                    <asp:TemplateField>
                        <itemtemplate>
                            <asp:Button ID="btnLock" Text="Lock" CommandName="Lock" CommandArgument=<%# Eval("OrderID") %> runat="server" />
                        </itemtemplate>    
                    
            </columns>
        
    </div>
</itemtemplate>

</columns>

</contenttemplate>

Thanks in advance.