No, what you are looking for here is called self modifying code. It
is possible in some computer languages but not VBA. It has something
to do with VBA being a just-in-time compiled language that compiles at
the sub/function level. If it was a JIT compile at the statement
level it could do what you are looking for.

But, there is a way to work  with your textbox properties in a loop:

Private Sub CommandButton1_Click()
Dim ctrl As Variant
Dim i1 As Integer
Dim a1(20) As String
i1 = 1
For Each ctrl In UserForm1.Controls
If InStr(ctrl.Name, "TextBox") > 0 Then
a1(i1) = ctrl.Value
i1 = i1 + 1
End If
Next
End Sub

This code snippit uses a loop to store the values of your userfrom
into an array.