Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/HtmlString.cs

@@ -0,0 +1,26 @@
+//------------------------------------------------------------------------------
+// <copyright file="HtmlString.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web {
+    //  Simple objects that wraps a string that is assumed to not need HTML encoded.
+    //  It implements IHtmlString, so when calling HttpUtility.HtmlEncode(htmlString), the string won't be encoded.
+    public class HtmlString: IHtmlString {
+
+        private string _htmlString;
+
+        public HtmlString(string value) {
+            _htmlString = value;
+        }
+
+        public string ToHtmlString() {
+            return _htmlString;
+        }
+
+        public override string ToString() {
+            return _htmlString;
+        }
+    }
+}