Dry data: Client using the Database class.

Client4.cs

public class Client4
{
    private readonly Database _db;

    public Client4(Database db)
    {
        _db = db;
    }

    public IEnumerable<User> GetCompanyUsers(string company)
    {
        return _db.ExecuteReader("spGetCompanyUsers",
            new[] { new SqlParameter("@companyName", company) },
            r => new User
                     {
                         Id = (string)r["id"],
                         UserName = (string)r["user"],
                         Name = (string)r["name"],
                         Email = (string)r["emailAddress"],
                         Phone = (string)r["cellPhone"],
                         ZipCode = (string)r["zip"]
                     });
    }

    public string GetUserEmail(string userId)
    {
        return _db.ExecuteScalar("spGetEmailForUser",
            new[] { new SqlParameter("@userId", userId) },
            o => o as string);
    }

    public void StoreUser(User u)
    {
        _db.ExecuteNonQuery("spInsertOrUpdateUser",
            new[]
                {
                    new SqlParameter("@userId", u.Id),
                    new SqlParameter("@user", u.UserName),
                    new SqlParameter("@name", u.Name),
                    new SqlParameter("@emailAddress", u.Email),
                    new SqlParameter("@cellPhone", u.Phone),
                    new SqlParameter("@zip", u.ZipCode)
                });
    }
}