Dry data: Naive data client

Client1.cs

public class Client1
{
    private readonly string _connStr;

    private readonly DbProviderFactory _dpf;

    public Client1(string connStr) : this(connStr, 
      DbProviderFactories.GetFactory("System.Data.SqlClient"))
    {}

    public Client1(string connStr, DbProviderFactory dpf)
    {
        _connStr = connStr;
        _dpf = dpf;
    }

    private DbParameter CreateParameter(string name, object val) 
    {
        var p = _dpf.CreateParameter();
        p.ParameterName = name;
        p.Value = val;
        return p;
    }

    public IEnumerable<User> GetCompanyUsers(string company)
    {
        var result = new List<User>();
        using (var conn = _dpf.CreateConnection())
        using (var cmd = _dpf.CreateCommand())
        {
            conn.ConnectionString = _connStr;
            conn.Open();
            cmd.Connection = conn;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "spGetCompanyUsers";
            var p = CreateParameter("@companyName", company);
            cmd.Parameters.Add(p);
            var reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                var u = new User
                {
                    Id = (string) reader["id"],
                    UserName = (string) reader["user"],
                    Name = (string) reader["name"],
                    Email = (string) reader["emailAddress"],
                    Phone = (string) reader["cellPhone"],
                    ZipCode = (string) reader["zip"]
                };
                result.Add(u);
            }
        }
        return result;
    }

    public string GetUserEmail(string userId)
    {
        using (var conn = _dpf.CreateConnection())
        using (var cmd = _dpf.CreateCommand())
        {
            conn.ConnectionString = _connStr;
            conn.Open();
            cmd.Connection = conn;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "spGetEmailForUser";
            var p = CreateParameter("@userId", userId);
            cmd.Parameters.Add(p);
            return (string) cmd.ExecuteScalar();
        }
    }

    public void StoreUser(User u)
    {
        using (var conn = _dpf.CreateConnection())
        using (var cmd = _dpf.CreateCommand())
        {
            conn.ConnectionString = _connStr;
            conn.Open();
            cmd.Connection = conn;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "spInsertOrUpdateUser";
            var ps = new [] {
                CreateParameter("@userId", u.Id),
                CreateParameter("@user", u.UserName),
                CreateParameter("@name", u.Name),
                CreateParameter("@emailAddress", u.Email),
                CreateParameter("@cellPhone", u.Phone),
                CreateParameter("@zip", u.ZipCode)
            };
            cmd.Parameters.AddRange(ps);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.ExecuteNonQuery();
        }
    }
}