class Program
    {
        static void Main(string[] args)
        {
           
            using (SqlConnection con = new SqlConnection(@"Data Source=...;Initial Catalog=...;Integrated Security=True;Connection Timeout=60"))
            {

                try
                {
                    con.Open();
                    SqlCommand CTCUCM = new SqlCommand("BaseForCUCM", con);
                    CTCUCM.CommandType = CommandType.StoredProcedure;
                    CTBCUCM.ExecuteNonQuery();
                    con.Close();

                    string query = "select  * from ...";
                    SqlCommand command = new SqlCommand(query, con);
                    con.Open();
                    SqlDataReader SQLreader = command.ExecuteReader();
                    StreamWriter ditail;
                    ditail = new StreamWriter("//10.5.5.5/Phone/Phone.csv", false, Encoding.Default);
                    ditail.WriteLine(@"FIO;Filial;Post;Phone1;Phone2;Phone3;Phone4;Phone5");
                    if (SQLreader.HasRows)
                    {
                        while (SQLreader.Read())
                        {
                            ditail.WriteLine(@"" + SQLreader.GetValue(0).ToString() + ";" + SQLreader.GetValue(1).ToString() + ";" + SQLreader.GetValue(2).ToString() + ";" + SQLreader.GetValue(3).ToString() + ";" + SQLreader.GetValue(4).ToString() + ";" + SQLreader.GetValue(5).ToString() + ";" + SQLreader.GetValue(6).ToString() + "");      
                        }
                    }      
                    else
                   {...}
                    ...
                    {