What is the difference between binding data in data grid view methods ??

 <ItemTemplate>
    <asp:LinkButton ID="lnkBtnUserName" runat="server" 
   Text='<%# DataBinder.Eval(Container.DataItem,"UserFirstName")%>'
                                            CommandArgument='<%# Eval("UserID") %>' OnClick="lnkBtnUserName_Click" />
                                    </ItemTemplate>

and this second one

 <asp:TemplateField HeaderText="Employee ID">
      <ItemTemplate>
          <asp:Label ID="lblempid" runat="server" Text='<%# Bind("EmpId.EmpId") %>'></asp:Label>
      </ItemTemplate>
</asp:TemplateField>

means in

method 1

Text='<%# DataBinder.Eval(Container.DataItem,"UserFirstName")%>'
          CommandArgument='<%# Eval("UserID") %>' 

method 2

Text='<%# Bind("EmpId.EmpId")

also explain use one this CommandArgument='<%# Eval("UserID") in 1st one ????