How to get the command argument value outside the gridview.

<asp:GridView ID="MyGridView" runat="server">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:LinkButton ID="MyLinkButton" CommandArgument="A" CommandName="Link" runat="server">Click</asp:LinkButton>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

MyGridView.DataSource = data;
MyGridView.DataBind();

foreach (GridViewRow row in MyGridView.Rows)
{
    // The linkbutton is in the first cell in my example
    TableCell cell = row.Cells[0];

    LinkButton MyLinkButton = (LinkButton)cell.FindControl("MyLinkButton");

    System.Diagnostics.Debug.WriteLine(MyLinkButton.CommandName);
    System.Diagnostics.Debug.WriteLine(MyLinkButton.CommandArgument);
}