Eval() display custom value if null

Question

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Answer 1

I will suggest to do it in SQL only:

using ISNULL(expression, value_if_expression_is_null) or

COALESCE(expression, expression2, expression3)

example :

SELECT
  Name, DOB,
  (CASE WHEN Address1 IS NULL THEN 'NA' ELSE Address1 END) AS Address1,
  (CASE WHEN Address2 IS NULL THEN 'NA' ELSE Address2 END) AS Address2,
  ...
FROM Users

or

SELECT 
  Name, DOB, Address1, 
  coalesce(Address2,'NA'), coalesce(City,'NA'), 
  coalesce(State,'NA'), coalesce(Zip,'NA')
FROM Users

Answer 2

Well you can try to do something like:

<%#(string.IsNullOrEmpty(Eval("TypeOfPainting").ToString()) ? "NA" : Eval("TypeOfPainting"))%>

Answer 3

Your control is runat="server" Why dont you control the value in codebehind?

If (string.IsNullOrEmpty(TypeofPaintingValue))
{
  TypeofPainting.Text="NA";
}

Answer 4

by creating a public method You can complete this task very easily like

public string testbind(object myvalue)
{
  if (myvalue == null)
  {
     return "NA value";
  }

  return myValue.ToString();
}

Label Code:

<asp:Label ID="TypeOfPaintingLabel" Text='<%# testbind(Eval("TypeOfPainting")) %>' runat="server"></asp:Label>

Or you may use

<%#(String.IsNullOrEmpty(Eval("TypeOfPainting").ToString()) ? "NA" : Eval("TypeOfPainting"))%>

You have to follow this type of scenarion.

Hope it works.

Answer 5

you can set this things from database side also

ISNULL(TypeOfPainting,'NA') AS TypeOfPainting