loop over all textboxes in a form, including those inside a groupbox

Question

I have several textboxes in a winform, some of them are inside a groupbox. I tried to loop over all textboxes in my form:

For Each c As Control In Me.Controls         


        

Answer 1

You can use this function, linq might be a more elegant way.

Dim allTxt As New List(Of Control)
For Each txt As TextBox In FindControlRecursive(allTxt, Me, GetType(TextBox))
   '....'
Next

Public Shared Function FindControlRecursive(ByVal list As List(Of Control), ByVal parent As Control, ByVal ctrlType As System.Type) As List(Of Control)
    If parent Is Nothing Then Return list
    If parent.GetType Is ctrlType Then
        list.Add(parent)
    End If
    For Each child As Control In parent.Controls
        FindControlRecursive(list, child, ctrlType)
    Next
    Return list
End Function