Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/WebParts/WebPartHelpVerb.cs

@@ -0,0 +1,62 @@
+//------------------------------------------------------------------------------
+// <copyright file="WebPartHelpVerb.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls.WebParts {
+
+    using System;
+
+    internal sealed class WebPartHelpVerb : WebPartActionVerb {
+
+        private string _defaultDescription;
+        private string _defaultText;
+
+        private string DefaultDescription {
+            get {
+                if (_defaultDescription == null) {
+                    _defaultDescription = SR.GetString(SR.WebPartHelpVerb_Description);
+                }
+                return _defaultDescription;
+            }
+        }
+
+        private string DefaultText {
+            get {
+                if (_defaultText == null) {
+                    _defaultText = SR.GetString(SR.WebPartHelpVerb_Text);
+                }
+                return _defaultText;
+            }
+        }
+
+        // Properties must look at viewstate directly instead of the property in the base class,
+        // so we can distinguish between an unset property and a property set to String.Empty.
+        [
+        WebSysDefaultValue(SR.WebPartHelpVerb_Description)
+        ]
+        public override string Description {
+            get {
+                object o = ViewState["Description"];
+                return (o == null) ? DefaultDescription : (string)o;
+            }
+            set {
+                ViewState["Description"] = value;
+            }
+        }
+
+        [
+        WebSysDefaultValue(SR.WebPartHelpVerb_Text)
+        ]
+        public override string Text {
+            get {
+                object o = ViewState["Text"];
+                return (o == null) ? DefaultText : (string)o;
+            }
+            set {
+                ViewState["Text"] = value;
+            }
+        }
+    }
+}