If dataitem is Null I want to show 0
Null
0
\' runat=\"server\">
Try replacing <%# Eval("item") %> with <%# If(Eval("item"), "0 value") %> (or <%# Eval("item") ?? "0 value" %>, when using C#).
<%# Eval("item") %>
<%# If(Eval("item"), "0 value") %>
<%# Eval("item") ?? "0 value" %>