Problem With Commandtype - Namespaceproblem?

Hi,
I have do some corretion in my aspxpage and the codebehind-page and have a problem right here (marked in bold):
 
 
Imports System.Data.SqlClient

Partial Public Class News
    Inherits System.Web.UI.Page

    Private Sub DetailsView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles DetailsView1.DataBound

        If DetailsView1.CurrentMode = DetailsViewMode.Insert Or _
                DetailsView1.CurrentMode = DetailsViewMode.Edit Then

            DirectCast(DetailsView1.FindControl("datumTextbox"), TextBox).Text = Now

        End If
    End Sub

    Private Sub DetailsView1_ItemUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DetailsViewUpdateEventArgs) Handles DetailsView1.ItemUpdating
        If Not IsDate(e.NewValues("Datum")) Then
            Exit Sub
        End If


        Dim Conn As New SqlConnection(ConfigurationManager.ConnectionStrings("connpferde").ConnectionString)

        Conn.Open()

        Dim cmd As New SqlCommand()
        cmd.Connection = Conn

        cmd.CommandText = "UPDATE News SET Datum=@Datum WHERE ID=@ID"

        cmd.Parameters.Add(New SqlParameter("@datum", CDate(e.NewValues("Datum"))))
        cmd.Parameters.Add(New SqlParameter("@ID", e.NewValues("NewsID")))

        cmd.CommandType = CommandType.Text

        cmd.ExecuteNonQuery()
        Conn.Close()
    End Sub
End Class

 
I'm told that the Name   CommandType   is not defined.  When I kill CommandType and the equal sign and set the equal-sign combined with using the completingagent
it would suggested Data.CommandType.Text.  On using that the running fails and Im told that the there is a missanderstanding with my  Admin.master-Page.
How can I correct this phrase.
Regards