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duvida webservice função adicionar

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boas pessoal preciso de ajuda fiz um webservice assim

[WebMethod(Description = "Regista Serviço")]
        public int Insertregist(int nserv,string datein, string dateout, int tempo, int cliente)

            int cont = 0;
                SqlConnection conn = new SqlConnection();

            conn.ConnectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Trabalho isi\data\isi.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True";

            string query = @"insert into serviço(nserv,datein,dateout,tempo,cliente) values(@nserv,@datein,@dateout,@tempo,@cliente)";
            SqlCommand ins = SqlCommand (query, conn);

                //Instanciar parâmetros
            ins.Parameters.Add("@nserv", SqlDbType.Int).Value = nserv;  
           ins.Parameters.Add ("@datein", SqlDbType.Char).Value= datein;
           ins.Parameters.Add ("@dateout", SqlDbType.Char).Value = dateout;
           ins.Parameters.Add ("@tempo", SqlDbType.Int).Value = tempo;
            ins.Parameters.Add ("@nclient", SqlDbType.Int).Value = cliente;


            return cont;

mas dá erro. aparece isto:

Error 1 'System.Data.SqlClient.SqlCommand' is a 'type' but is used like a 'variable' C:\Trabalho isi\Isi\Isi\Service1.asmx.cs 79 30 Isi

depois  aconselha a gerar um metodo e gera automaticamente fazendo isto:

        private SqlCommand SqlCommand(string query, SqlConnection conn)
            throw new NotImplementedException();

corrige o erro , mas nao dá para adicionar

agradecia k me ajudassem

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