รับค่าจาก Textbox จะบันทึกลงใน Sql Server 2005 Express แต่มันไม่บันทึกให้อ่ะครับช่วยที....

 Dim CN As New OleDbConnection
        Dim Server As String = "HOME-632DB7B2A9\sqlExpress"
        Dim UserID As String = "sa"
        Dim password As String = "admins"
        CN.ConnectionString = "provider=SQLOLEDB;data source=" & Server & ";user id=" _
                  & UserID & ";Password=" & password & ";persist security info=False"

        Dim sql As String = "INSERT INTO tb_username(username,password)" _
         & "VALUES ('" & txt_user.Text & "', '" & txt_pass.Text & "')"
        
        Dim DB As New OleDbDataAdapter(sql, CN)