Forms :: Hide A Button When A Record Is Found In Database

I want to show/hide a button on my form.The button is for entering a new record in the table of the database.Now when i Load the form, i want to check if there are already records in the table for a specific lanID. When there are no records, the butten has to be displayed. When there are already records for that lanID the button has to be hidden.

I have found some code to tackle that, but When i use the rs.MoveLast it hides the button when there are records, but when there are no records it gives an error that there are no records found. I almost forgot to say that i use Access 2010..Here is the code that i use:

Code:

Private Sub Form_Load()
Dim SQL As String
Dim rs As DAO.Recordset
Dim landmeterID As String
landmeterID = [Forms]![MainForm]![LanIDTxt]
SQL = "select * from dbo_Lan_Opleiding where Id_landmeter ='" & landmeterID & "'"
Set rs = CurrentDb.OpenRecordset(SQL)

[code]....