Two CommandField(Select) in one gridview

How Check which one i clicked
<asp:GridView ID="grid" runat="server" CssClass="table table-bordered table-hover table-striped text-nowrap" OnSelectedIndexChanged="grid_SelectedIndexChanged" > <Columns> <asp:CommandField ButtonType="Button" HeaderText="Edit" ControlStyle-CssClass="btn btn-primary" ShowHeader="True" ShowSelectButton="True" SelectText="Edit" ControlStyle-Width="70px"/> <asp:CommandField ButtonType="Button" HeaderText="Delete" ControlStyle-CssClass="btn btn-danger" ShowHeader="True" ShowSelectButton="True" SelectText="Delete" ControlStyle-Width="70px"/> </Columns> <Select ...