Custom Compiler Warnings

[MyAttribute("This code sux and should be looked at")]
public sub DoEverything(){}

[Obsolete("Should be refactored")]
public class MustRefactor: System.Attribute{}

#warning "Do not use ABC, which is deprecated. Use XYZ instead."

#pragma message ( "text" )

public void DoEverything() {
   #warning "This code sucks"
}

[Obsolete("Mapping ToDo")]
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Property)]
public class MappingToDo : System.Attribute
{
    public string Comment = "";

    public MappingToDo(string comment)
    {
        Comment = comment;
    }

    public MappingToDo()
    {}
}

[MappingToDo("Some comment")]
public class MembershipHour : Entity
{
    // .....
}