Dim treeview1 As New TreeView
        Dim nd As TreeNode = treeview1.Nodes.Add("TEST1")
 
        treeview1.SelectedNode = nd
 
        Dim myConditions() As String = {"test1", "test2", "test3"}
 
        If myConditions.Contains(treeview1.SelectedNode.Text.ToLower) Then
            MsgBox("gefunden")
        Else
            MsgBox("nicht gefunden")
        End If