how create web service asmx who return arraylist rom sql server

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C#

VB

SQL

server

service

web

ASMX

I need a help
i would like create an web service asmx who return arraylist from sql server !
i have an error System.NullReferenceException: la reference de l'objet n'est pas definie une instance de l'objet
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<webmethod()> _
Public Function data() As ArrayList()
Dim con As New SqlConnection
con.ConnectionString = "Data Source=.;Initial Catalog=personnel;Integrated Security=True"
con.Open()
Dim Sql As String = "select Nom from Employes "
Sql = String.Format(Sql)
Dim Command As New SqlCommand(Sql, con)
Dim dr As SqlDataReader
dr = Command.ExecuteReader()
'Dim result = ""
While dr.Read()
result.Add(dr(0).ToString)
Return result.ToArray
End While
Return result.ToArray
Dim sas As String
Dim x As New web_servive_array.Web
sas = x.data(Sql).ToString
con.Close()
Return result.ToArray
End Function

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please help