Question

The code I have is:

Dim Dbase() As String = Nothing

Dbase(0) = Db_ComboBox.Text

I have declared Dbase as array and assigned Nothing, Db_ComboBox is a combobox.

For that assignment statement, I’m getting the following error: “Reference ‘Dbase’ has a value of ‘Nothing’“

What is the reason for this error, and how can I take the value from the combobox and save it in the array?

Answer 1

Let’s look at your code:

Dim Dbase() As String = Nothing

Dbase(0) = Db_ComboBox.Text

Especially the first line. That first line creates a variable that can refer to an array, but the = Nothing portion explicitly tells it, “Do not create a real array here yet”. You have, effectively, a pointer that doesn’t point to anything.

I get here that what you really need is a List collection that you can append to over time:

Dim Dbase As New List(Of String)()
Dbase.Add(Db_ComboBox.Text)