operator/operand type mismatch when update dbf file

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VBScript

OleDb

i have a program needs to update data in dbf file. but it keeps appear error 'operator/operand type mismatch'. here is the code :

Dim con As OleDbConnection = New OleDbConnection("Provider=vfpoledb;Data Source=C:\folder\pay.dbf;Collating Sequence=machine;")
    Try


        Dim strSQL As String = "UPDATE pay.dbf SET work = 20  WHERE emp = 102"
        Dim cmd As OleDbCommand = New OleDbCommand(strSQL, con)
        con.Open()
        Dim myDA As OleDbDataAdapter = New OleDbDataAdapter(cmd)
        Dim myDataSet As DataSet = New DataSet()
        ' Using DataAdapter object fill data from database into DataSet object
        myDA.Fill(myDataSet, "MyTable")
        ' Binding DataSet to DataGridView
        DGV.DataSource = myDataSet.Tables("MyTable").DefaultView
       
        
    Catch ex As Exception
        MessageBox.Show(ex.Message, "Error Select Data")

    Finally
        If con IsNot Nothing Then
            con.Close()
        End If
    End Try

please help me..