Help With Trying To Insert The UserName Of The Logged In User Into The DB Field UserID

How do I insert the UserName of the Logged in user into the DB field UserID. I created a web form page, and added a form
view control set the page default to Insert Mode.  The Page is used to insert data.  I have a hidden field called UserID that I would like to capture the Logged in user.  I have logged in to the default page with userID and password, added a new record, and the db table field UserID is empty. I have been trying to figure out what I am doing worng, but no luck, Please suggest the best way to do this.  I have listed what I have done thus far? 

I have added the login Control from Login and added it to the page as a hidden field thinking that I needed to have this field on the page to get this to work where you copy the value in the Loginname field to the useridTextbox on the formview1 insert template.  I read on line where the method below is better.  Please tell me what I am doint wrong.


System.aspx---------------------------------------------------------------------------------------------------------------
1) <asp:FormView ID="FormView1" runat="server" AllowPaging="True" DataKeyNames="SystemID"
        DataSourceID="SystemSqlDataSource1" DefaultMode="Insert" Width="583px">

2) <asp:TextBox ID="UserIDTextBox" runat="server"
                Text='<%# Bind("UserID") %>' Visible="False"></asp:TextBox><br />

3) <asp:SqlDataSource ID="SystemSqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:RCMISConnectionString %>"
        DeleteCommand="DELETE FROM [tblSystem] WHERE [SystemID] = @SystemID" InsertCommand="INSERT INTO [tblSystem] ([SystemID], [SystemDesc], [Inactive], [TimeStampEntry], [TimeStampUpdate], [UserID]) VALUES (@SystemID, @SystemDesc, @Inactive, GETDATE(), @TimeStampUpdate, @UserID)"

4)         <InsertParameters>
            <asp:Parameter Name="SystemID" Type="String" />
            <asp:Parameter Name="SystemDesc" Type="String" />
            <asp:Parameter Name="Inactive" Type="Boolean" />
            <asp:Parameter Name="TimeStampEntry" Type="DateTime" />
            <asp:Parameter Name="TimeStampUpdate" Type="DateTime" />
            <asp:Parameter Name="UserID" Type="String" />
             </InsertParameters>
    </asp:SqlDataSource>

System.aspx.vb---------------------------------------------------------------------------------------------------------
5) Partial Class MemberPages_RCM_frmSystem
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        'UserIDTextBox.Text = Membership.GetUser().ProviderUserKey.ToString()

    End Sub

    Protected Sub FormView1_ItemInserted(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewInsertedEventArgs) Handles FormView1.ItemInserted
        'Set the UserID Value to the currently logged on user's ID
        e.Values("UserID") = Membership.GetUser().ProviderUserKey

    End Sub

End Class


Thank you in advance,