UnityEditor.Selection.Add C# (CSharp) Method

        internal static void Add(Object obj)
        {
            if (obj != null)
            {
                Add(obj.GetInstanceID());
            }
        }

 internal static void Add(UnityEngine.Object obj)
 {
     if (!(obj != (UnityEngine.Object)null))
     {
         return;
     }
     Selection.Add(obj.GetInstanceID());
 }