VB service export SQL to CSV - vb.net

Question

I have created a service that is supposed to pass data from SQL to CSV, by creating a CSV file. It has no errors, but i run it and nothing happens.
1) Is there something I am missing?
2) If it works, and i want to convert to txt file, is it enough to change the "CSV" to "txt" parts?
My code:
#Region "Export SQL TO CSV"
Public Shared Function WriteCSV(ByVal input As String) As String
Try
If (input Is Nothing) Then
Return String.Empty
End If
Dim containsQuote As Boolean = False
Dim containsComma As Boolean = False
Dim len As Integer = input.Length
Dim i As Integer = 0
Do While ((i < len) _
AndAlso ((containsComma = False) _
OrElse (containsQuote = False)))
Dim ch As Char = input(i)
If (ch = Microsoft.VisualBasic.ChrW(34)) Then
containsQuote = True
ElseIf (ch = Microsoft.VisualBasic.ChrW(44)) Then
containsComma = True
End If
i = (i + 1)
Loop
If (containsQuote AndAlso containsComma) Then
input = input.Replace("""", """""")
End If
If (containsComma) Then
Return """" & input & """"
Else
Return input
End If
Catch ex As Exception
Throw
End Try
End Function
Private Sub ExtoCsv(ByVal sender As Object, ByVal e As EventArgs)
Dim sb As StringBuilder = New StringBuilder
Using db As Database.RecordSet = admin.Database.OpenRecordsetReadOnly("select USERID, NAME1 from usertable WHERE I_ID=2")
Dim userid As String = db("USERID").Value
Dim name1 As String = db("NAME1").Value
For i As Integer = 1 To db.RecordCount
sb.Append(WriteCSV(userid + "," + name1 + ","))
sb.AppendLine()
db.MoveNext()
Next
End Using
File.WriteAllText("C:\Users\user1\Desktop\ex1.csv", sb.ToString)
If (Not System.IO.Directory.Exists("C:\Users\user1\Desktop\ex1")) Then
System.IO.Directory.CreateDirectory("C:\Users\user1\Desktop\ex1")
End If
End Sub
#End Region