Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/HtmlControlPersistable.cs

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+//------------------------------------------------------------------------------
+// <copyright file="HtmlControlPersistable.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI {
+    using System.ComponentModel;
+    using System;
+
+    [AttributeUsage(AttributeTargets.Property)]
+    internal sealed class HtmlControlPersistableAttribute : Attribute {
+
+        internal static readonly HtmlControlPersistableAttribute Yes = new HtmlControlPersistableAttribute(true);
+        internal static readonly HtmlControlPersistableAttribute No =  new HtmlControlPersistableAttribute(false);
+        internal static readonly HtmlControlPersistableAttribute Default = Yes;
+        private bool persistable = true;
+
+        internal HtmlControlPersistableAttribute(bool persistable) {
+            this.persistable = persistable;
+        }
+
+        internal bool HtmlControlPersistable {
+            get {
+                return persistable;
+            }
+        }
+
+        public override bool Equals(object obj) {
+            if (obj == this) {
+                return true;
+            }
+
+            HtmlControlPersistableAttribute other = obj as HtmlControlPersistableAttribute;
+            return (other != null) && other.HtmlControlPersistable == persistable;
+        }
+
+        public override int GetHashCode() {
+            return persistable.GetHashCode();
+        }
+
+        public override bool IsDefaultAttribute() {
+            return (this.Equals(Default));
+        }
+    }
+}