How can i amend this to check item in database?

[experience]

Im trying to make a form so the client can type in their email address and have their activation email resent - similar to a password resend form

The following works, except it will include activation codes for orders that havnt been paid for.

I have a seperate Orders table which has a column Paid - orders which have been paid are marked -1

I cant figure out how to retrieve just the activation codes for the orders which have been paid

I have tried making a query in the dataset such as

SELECT CustomerEmail
FROM orders
WHERE (IsPaid = -1)

However i dont know if this is right or how to implement it into the following:

Private Sub sendemail()
        Dim CustomerEmail As String
 
        CustomerEmail = txtCustomerEmail.Text
        'Checks if Email is in DB
        Dim da As New ProjectDataSetTableAdapters.LicenseTableAdapter()
        Dim dt As ProjectDataSet.LicenseDataTable = da.GetDataByCustomerEmail(CustomerEmail)
        If dt.Rows.Count = 0 Then
            txtCustomerEmail.Text = "Email Address Not Found"
        Else
            'Check if the order has been paid
 
            '*********************************
            '*********************************
 
            'if so then email activaion details
 
            Dim daLic As New ProjectDataSetTableAdapters.LicenseTableAdapter()
            Dim dtLic As ProjectDataSet.LicenseDataTable = daLic.GetDataByCustomerEmail(CustomerEmail)
            If dtLic.Rows.Count > 0 Then
                Dim drLic As ProjectDataSet.LicenseRow = dtLic.Rows(0)
 
                Dim msg As New MailMessage()
                msg.IsBodyHtml = False
                msg.From = New MailAddress("[email protected]", "[email protected]")
                msg.To.Add(CustomerEmail)
                msg.Subject = "MyWebsite Activation ID"
 
                Dim body As New StringBuilder()
                body.AppendLine("Thank you for your purchase")
                body.AppendLine()
                body.AppendLine("Here are your activation details:")
                body.AppendLine()
 
                For i As Integer = 0 To dtLic.Count - 1
                    drLic = dtLic.Rows(i)
                    body.AppendLine(String.Format("{0} Activation Code: {1}  |  Email: {2}", drLic.Product, drLic.ActivationCode, drLic.CustomerEmail))
                    body.AppendLine(String.Format("{0} Download Link: www.MyWebsite.co.uk/{0}setup.html", drLic.Product, drLic.ActivationCode))
                    body.AppendLine()
                Next
                body.AppendLine()
                body.AppendLine("Please note each license code above is for 1 PC only")
                body.AppendLine()
                    body.AppendLine()
                body.AppendLine("Thank You")
                body.AppendLine()
                body.AppendLine("MyWebsite")
                body.AppendLine("www.MyWebsite.co.uk")
                body.AppendLine()
                msg.Body = body.ToString()
 
                Dim smtp As New SmtpClient()
                smtp.Send(msg)
            End If
        End If
 
 
    End Sub