webservices

I want to partNos information came from the database.
how can I do that with webservices?


string[] partNos = { "partno1", "partno2","partno3", "partno4" };


[System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()]
    public static string[] GetCompletionList(string prefixText, int count, string contextKey)
    {
        string[] partNos = { "partno1", "partno2","partno3", "partno4" };
        return(from m in partNos where m.StartsWith(prefixText,StringComparison.CurrentCultureIgnoreCase) select m).Take(count).ToArray();
    }