Asp.Net(C#) inline coding Eval if statement

Hi all;

How to make inline eval if control ?

<asp:TemplateField HeaderText="Name">
  开发者_运维百科              <ItemTemplate>
                    <%# if(Eval("Bla Bla Bla").ToString().Length <= 15){Eval("Bla Bla Bla")}else{Eval("Bla Bla Bla").ToString().Substring(0,15)}%>
                </ItemTemplate>
            </asp:TemplateField>

Use the tertiary expression '?':

<asp:TemplateField HeaderText="Name">
                <ItemTemplate>
                    <%# Eval("Bla Bla Bla").ToString().Length <= 15 ? Eval("Bla Bla Bla") : Eval("Bla Bla Bla").ToString().Substring(0,15) %>
                </ItemTemplate>
            </asp:TemplateField>