In C# you can set an attribute to the setter. It works in normal .NET 4.5

AttibutesOnGetSet.cs

// Extracted from System.Web
public IPrincipal User
{
    get
    {
        return this._principalContainer.Principal;
    }
    [SecurityPermission(SecurityAction.Demand, ControlPrincipal=true)]
    set
    {
        this.SetPrincipalNoDemand(value);
    }
}

// another one example 
public int SampleGetSet
{
    [Display(Name = "", Description = "")]
    get { return sample; }
    [Display(Name = "", Description = "")]
    set { sample = value; }
}

// What is the purpose of that is a mistery for now.