How do I enter a data to B1 form via windows form?

Question

I'm trying to add the data from a windows form, to the SAP B1 form (e.g. Sales order), now i'm just trying 1 component only which is the CustCode.
I've been thinking about this but i can't figure it out like how's the structure of the class I should create...
In my VBproj (VS_2005), i have a simple form (just "TextBox1" and "Button1"), then I have a class "appending.vb":
Option Strict Off
Option Explicit On
Public Class appending
    Public oItem As SAPbouiCOM.Item
    Public oTextbox As SAPbouiCOM.EditText
    Private WithEvents SBO_Application As SAPbouiCOM.Application
    Private Sub SetApplication()
        Dim SboGuiApi As New SAPbouiCOM.SboGuiApi
        Dim sConnectionString As String
        sConnectionString = Environment.GetCommandLineArgs.GetValue(1)
        SboGuiApi.Connect(sConnectionString)
        SBO_Application = SboGuiApi.GetApplication()
    End Sub
    Public Sub New()
        MyBase.New()
        SetApplication()
    End Sub
End Class
and also Form1.vb class:
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim oappend As New appending
        If oappend.oitem.UniqueID = 4 Then
            oappend.oitem.String = TextBox1.Text
        End If
    End Sub
End Class
Note that unique ID 4 is because i searched in the system information (CtrlSfihtD) that the customerID in the sales order form has the Item = 4, which is the unique ID, but this property is readonly prop, so that I can't directly instruct to append the data from textbox1 to the item where unique ID is 4 (..UniqueID = 4..)
I know my code just wont work at all, but i'm really have no more idea about this....
critics, comment and idea please...
Thanks,
Martin

Answer 1

Dear Martin,
I think String property is on EditText object not Item object.
Please use Item.Specific to get the coresponding EditText and then set String.
Regards,
Jay.