Update a record on Windows sql server 2005 Mobile Edition.

I use Visual Studio 2005 Pro.
I try to make a little application to my Smart Device Windows Mobil 5.0 Pocket Pc.
I have make a little sql database name: SQLTEST
In this database a have a Table named: NAME
In this table , I have 2 colums named: NAME, LASTNAME.

I have inserted some data in to the table NAME.

I use Form1.vb
In this form a have following things.

2 textbox
5 button
bindingsource
sqltestdataset
sqltesttableadapter
datagrid

Bindingsource are connected to sql database named: SQLTEST. And the table named: NAME.
Datagrid are connected to bindingsource.
2 textbox are connected to bindingsource.

When I start the application,
form1 show, and the datagrid is show some datarecord that I have insert manual in the Table.
That’s only 3 record’s.

And the data is showing in the 2 textbox.

I have 5 button’s on the form1.
1 button named ADD. In this button I have a code like this: Me.Bindingsource.AddNew()
2 button named NEXT. Code like this: Me.Bindingsource.MoveNext()
3 button named FIRST. Code like this: Me.Bindingsource.MoveFirst()
4 button named DELETE. Code like this: Me.Bindingsource.RemoveAll()
5 Button named UPDATE. Code like this:
Me.Bindingsource.EndEdit()
Me.Sqltesttableadapter.update(me.Sqltestdataset.name)

When I push the button named: NEXT, The textbox are showing the next record.
My problem is: When I push the ADD button. And type something in the 2 textbox, this record are show’n in the datagrid, and the textbox, when I clikk on the button’s FIRST, and NEXT.

I can put in some more record in the database, but when I close the application, and start it up again, the record are missing.
Only the 3 record, that I made before.
Is there some body ho can help me?