I try to insert a new record in a base SQL Server 2005, being still the guide.

In the page_load Event:

Me.oOrigen = CType(Me.RegisterBizObj(New Origen), Origen)
Me.IdOrigen = Integer.Parse(Request.QueryString("IdOrigen"))

Me.oOrigen.OrigenGetByID(Me.IdOrigen)
Session("dsOrigen") = oOrigen.DataSet

To insert:

Dim ds As DataSet = CType(Session("dsOrigen"), DataSet)

Me.oOrigen.NewRow(ds, Me.oOrigen.TableName)

Session("ds") = dsOrigen

To Save:

Dim ds As DataSet = CTyThpe(Session("dsOrigen"), DataSet)

If Me.Save(Me.oOrigen, ds, Me.oOrigen.TableName) = mmSaveDataResult.RulesPassed Then
Response.Redirect("OrigenCrud.aspx")
End If

Display that error:

System.NullReferenceException was unhandled by user code
Message="Referencia a objeto no establecida como instancia de un objeto."
Source="OakLeaf.MM2008.Framework"


Thank for your time

...Saludos Amigo...