Don't Do This

SystemUserAfterSRP.cs

public class SystemUser
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public string IsActive { get; set; }
}

SystemUserBeforeSRP.cs

public class SystemUser
{
    public Guid Id { get; set; }
    public string Email { get; set; }
    public string Name { get; set; }
    public string IsActive { get; set; }

    public bool IsValid() 
	{
		return !String.IsNullOrEmpty(this.Name);
	}

    public void Save() 
	{
		//Persist to database
	}

    public static SystemUser GetById(Guid id) 
	{
		//Retrieve from database
	}
}

UserRepositorySRP.cs

public class UserRepository
{
    public void Save(SystemUser user) 
	{
		//Persist to database
	}

    public static SystemUser GetById(Guid id) 
	{
		//Retrieve from database
	}
}

ValidUserSpecificationSRP.cs

public class ValidUserSpecification
{
    public bool IsSatisfied(SystemUser user) 
	{
	 	return !String.IsNullOrEmpty(user.Name);
	}
}