explication d'une fonction

s'il vous plais expliquez moi cette fonction
Code:
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Shared Function OpenTable(ByVal NomTable As String, ByVal SqlSource As String, ByVal Cnx As String) As DataTable
        'retourn le resultat du requette ds un table 
        ' sera util ds les reque de select
        Dim Cn As New SqlConnection
        Dim Cmd As SqlCommand
        Dim DAdap As SqlDataAdapter
        Dim DSet As New DataSet
        Dim DTable As DataTable
        Cn.ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings.Item(Cnx).ToString
        Cmd = New SqlCommand(SqlSource)
        Cmd.Connection = Cn
        DAdap = New SqlDataAdapter(Cmd)
        DAdap.Fill(DSet, NomTable)
        DTable = DSet.Tables(NomTable)
        Return DTable
    End Function
merci