sql server vb net ado odd record update

See more:

VB

ADO.NET

SQL-Server-2008R2

Hello,
I have a dbgrid connected to an sql server table with a bindingsource, the odd thing is that when I give value only to the first field (nvarchar) and do update it erases the value and leaves an empty record, when I give vaqlue to the first field and to the second or more (all other fields are date type) it accepts and record is proper.
code of update button

Private Sub ToolStripButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.Click
        Me.CarBindingSource3.EndEdit()
        If DataSet11.HasChanges Then
            Try
                SqlDataAdapter1.Update(DataSet11, "car")
                DataSet11.AcceptChanges()
            Catch eUpdate As System.Exception
                Throw eUpdate
            End Try
        End If
    End Sub

All fields are set to allow nulls in sql and table has PK.
Any idea?

Thank you