different ways in showing Eval value in Gridview

Hi,
I am using code a. in binding controls in Gridview ,but some times I see other developers use code b.
Can anyone explain the significant difference between both code


Code a.
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<asp:TemplateField HeaderText="dob"><ItemTemplate><asp:Label ID="lbldob" runat="server" Text='<%# Eval("dob") %>'></asp:Label></ItemTemplate></asp:TemplateField>


Code b.
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 <asp:TemplateField HeaderText="Fecha" SortExpression="Fecha" ItemStyle-Width="50px"><ItemTemplate><%# DataBinder.Eval(Container.DataItem, "Fecha", "{0:dd/MM/yyyy}")%></ItemTemplate></asp:TemplateField>


I am used to Code a.
thanks

Bob