Dlookup built dynamically

[Wyoming]

Hello, I am trying to dynamically build a Dlookup function.

The way I am trying to do this is by using a variable named strNull:
strNull = "IsNull(DLookup(""lunes"", """ & strConsulta & """))"
Being "lunes" the name of the field I'm looking for and strConsulta the name of the query where I want to look up. This query name is what I need to be dynamically generated.

After that I evaluate strNull like this: If strNull = True Then...

Well, when I run this I get the error 13 "Type Mismatch". I guess it has to do with the syntax I'm using to build the strNull variable but I can't manage to find the right way to do it.
Any suggestions?

Thanks!

[HansV]

strNull is a text string, not an expression, even though it contains the text of an expression. To evaluate the expression, use the Eval function:

If Eval(strNull) = True Then

[Wyoming]

I didn't know about this "Eval" function
Thanks!

[HansV]

It can be handy sometimes. See Application.Eval Method (Access).