1 屏蔽组建设计时属性                                                               
    1) 重载父类的属性，然后使用EditorBrowsable以及Browsable属性标记：                                                            
        例如，为了屏蔽基类的BackgroundImage属性，我们可以首先在子类中重载，然后为子类的BackgroundImage添加EditorBrowsable以及Browsable属性标记。                                                        
        [EditorBrowsable(EditorBrowsableState.Never), Browsable(false)]                                                         
            public override Image BackgroundImage                                                         
            {                                                         
                get                                                         
                {                                                         
                    return base.BackgroundImage;                                                         
                }                                                         
                set                                                         
                {                                                         
                    base.BackgroundImage = value;                                                         
                }                                                         
            }                                                             
            EditorBrowsable(EditorBrowsableState.Never),  指示隐藏显示在智能编辑提示功能intelliSense；Browsable(false)，指示隐藏显示在IDE控件属性页面。                                                        
            另外的一些情况，例如隐藏一些设计时不可见的属性，Browsable(false)也经常会被独立使用。                                                                                                        
    2）为控件编写一个designer, 在designer里面的PostFilterProperties方法中过滤掉不想要的属性。                                                           
        [Designer(typeof (MyDesigner))]                                                        
         public sealed class MyControl: System.Web.UI.WebControls.WebControl {}                                                        
        public class MyDesigner:System.Web.UI.Design.ControlDesigner                                                        
            {                                                        
                public MyDesigner()                                                        
                {}                                                        
                protected override void PostFilterProperties( IDictionary Properties )                                                        
                {                                                        
                    Properties.Remove( "BackgroundImage" );                                                        
                 }                                                        
            }

2 屏蔽效果