Using '<%# Eval("item") %>'; Handling Null Value and showing 0 aginst

Question

If dataitem is Null I want to show 0

<asp:Label ID="Label18" Text='<%# Eval("item") %>' runat="server"></asp:Label>

how can I accomplish this?

Thanks

Answer 1

Try replacing <%# Eval("item") %> with <%# If(Eval("item"), "0 value") %> (or <%# Eval("item") ?? "0 value" %>, when using C#).

Answer 2

I don't know ASP.NET very well, but can you use the ternary operator?

http://en.wikipedia.org/wiki/Ternary%5Foperation

Something like: (x=Eval("item")) == Null ? 0 : x

Answer 3

You can also create a public method on the page then call that from the code-in-front.

e.g. if using C#:

public string ProcessMyDataItem(object myValue)
{
  if (myValue == null)
  {
     return "0 value";
  }

  return myValue.ToString();
}

Then the label in the code-in-front will be something like:

<asp:Label ID="Label18" Text='<%# ProcessMyDataItem(Eval("item")) %>' runat="server"></asp:Label>

Sorry, haven't tested this code so can't guarantee I got the syntax of "<%# ProcessMyDataItem(Eval("item")) %>" entirely correct.

Answer 4

Moreover, you can use (x = Eval("item") ?? 0) in this case.

http://msdn.microsoft.com/en-us/library/ms173224.aspx