Get Session values in WebMethod using C# in ASP.Net

Hi all

How get session value in select statement in web method

I want to include the session value in the select sentence

I have this code

[System.Web.Script.Services.ScriptMethod()]
[System.Web.Services.WebMethod]
public static List<string> GetCompletionList(string prefixText, int count)
{
    using (OracleConnection con = new OracleConnection("data source=localhost:1521/orcl; user id=alhakimy; password=alhakimyyes;"))
    {
        using (OracleCommand com = new OracleCommand())
        {
            com.CommandText = "select doc_no, doc_name from doctors where city_no= Session['city_no'] and doc_name like '%" + prefixText + "%' ";
            com.Parameters.Add("@TextBox1", prefixText);
            com.Connection = con;
            con.Open();
            List<string> summ = new List<string>();
            using (OracleDataReader sdr = com.ExecuteReader())
            {
                while (sdr.Read())
                {
                    summ.Add(string.Format("{0}-{1}", sdr["DOC_NAME"], sdr["Doc_NO"]));
                }
            }
            con.Close();
            return summ;
        }
    }
}