Multiple DataKeyNames in GridView using c#

In this post i will show how to ADD multiple DataKeyNames in GridView and how to get(Read) them in the codebehind(RowCommand) using c#

ASPX page :

<asp:GridView ID="GridView1" runat="server" DataKeyNames="AdultID,ChildID" 

            AutoGenerateColumns="False" BackColor="White" BorderColor="#CC9966" 

            BorderStyle="None" BorderWidth="1px" CellPadding="4" 

            onrowcommand="GridView1_RowCommand">

            <Columns>

                <asp:BoundField DataField="AdultID" HeaderText="Adult ID" />

                <asp:BoundField DataField="CompanyName" HeaderText="Company" />

                <asp:BoundField DataField="ContactName" HeaderText="Name" />

                <asp:BoundField DataField="City" HeaderText="city" />

                <asp:BoundField DataField="Country" HeaderText="Country" />

                <asp:ButtonField HeaderText="Edit Entry" ButtonType="Button" CommandName="Edit" Text="Edit" />

                <asp:ButtonField HeaderText="Delete Entry" ButtonType="Button" CommandName="Delete" Text="Delete" />

            </Columns>

            <FooterStyle BackColor="#FFFFCC" ForeColor="#330099" />

            <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="#FFFFCC" />

            <PagerStyle BackColor="#FFFFCC" ForeColor="#330099" HorizontalAlign="Center" />

            <RowStyle BackColor="White" ForeColor="#330099" />

            <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="#663399" />

            <SortedAscendingCellStyle BackColor="#FEFCEB" />

            <SortedAscendingHeaderStyle BackColor="#AF0101" />

            <SortedDescendingCellStyle BackColor="#F6F0C0" />

            <SortedDescendingHeaderStyle BackColor="#7E0000" />

        </asp:GridView>

Code Behind :

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)

        {

            int index = Convert.ToInt32(e.CommandArgument);

            int id = Convert.ToInt32(GridView1.DataKeys[index].Values["AdultID"]);

            string validation = GridView1.DataKeys[index].Values["ChildID"].ToString();

            switch (e.CommandName)

            {

                case "Edits":

                    // Edit Method

                    break;

                case "Delete":

                    // Delete Method

                    break;

            }

        }