How to detect NULL/EMPTY value then replace with STRING?

Top of the morning to all.

Is it possible to detect NULL/EMPTY value from a certain field and then replace with some STRING?

I tried this to no avail:

Dim myData as String = document.field("Document Section 1\typeID").Value
If myData is Nothing Then myData = "1" Else myData = myData


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    Jakarta Development
    Seems to work

    Dim getData as String = document.field("Document Section 1\WHAT_FIELD").Value

    If (String.IsNullOrEmpty(getData)) Then

    getData = yourstring

    End If


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