You will need to verify that information you are passing is not NULL in the debugger. The exception is stating that some value is set to null. I would verify the following lines:

Dim SocSecNum As New Binding("text", ObjDatos_personales_sol1, "Datos_personales_sol.num_control")

Me.TextBox2.DataBindings.Add(SocSecNum)


>Cathy:
>
>Nope... ok to be more clear here is the error I got.
>
>An unhandled exception of type 'System.ArgumentNullException' occurred in system.windows.forms.dll
>
>Additional information: Value cannot be null.