i written windows services(dotnet)using high cpu usage

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Windows-service

This loop takes high cpu usage in windows services in dotnet
loop run(100000) times

Dim addresslist As New List(Of Dictionary(Of String, Object))
While i <= ds.Tables(0).Rows.Count - 1
    Dim Mobile As New Dictionary(Of String, Object)
    Mobile.Add("Slno", New Bson.BsonInt64(ds.Tables(0).Rows(i)(0).ToString()))
    Mobile.Add("User_SMS_Job_No", ds.Tables(0).Rows(i)(1).ToString())
    Mobile.Add("Mobile_number", ds.Tables(0).Rows(i)(2).ToString())
                 addresslist.Add(Mobile)
    i = i + 1
End While

please give replay any language no problem (c# or vb.net)