Only show text from database if field is not empty

 Hoping someone can help. I am using ASP.NET VB and i am wondering how
to only show text from database if data exists. I tried this but it
does not work.
Any help would be greatly appreciated.
I am new to .NET, in the past i have always used classic asp.
 
1 <td valign="top" style="border-right: 2px solid #031992">
2 (<%# Eval("VenderPhone1") %>) <%# Eval("VenderPhone2") %>- <%#Eval("VenderPhone3")%>
3
4 <% If String.IsNullOrEmpty(Trim("VenderAlt1").ToString) Then%>
5 <br />(<%#E ...