WCF / ASMX :: How To Call A Non Shared Function In A Shared Function

I want to call a non shared function in a shared function in which i am having a textbox control instance. Its giving no error but when i call this shared function from client callback it gives me no response

Any Idea except removing shared from the function.

Here is my code :

<WebMethod()> _
Public Shared Function myF() As String
Dim pg As New _Default
Return "{'Hello':'" & pg.setText & "'}"
End Function
Public Function setText() As String
Dim pg As New _Default
pg.TextBox1.Text = "This is a test"
Return pg.TextBox1.Text
End Function