From 2328c12c4db72fccb0815bc62f6f120538eb6032 Mon Sep 17 00:00:00 2001
From: Stephen Toub <stoub@microsoft.com>
Date: Thu, 4 May 2023 06:48:58 -0700
Subject: [PATCH] Annotate IHtmlString.ToHtmlString's return as nullable
 (#85742)

---
 .../System.Web.HttpUtility/ref/System.Web.HttpUtility.cs        | 2 +-
 .../System.Web.HttpUtility/src/System/Web/IHtmlString.cs        | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libraries/System.Web.HttpUtility/ref/System.Web.HttpUtility.cs b/src/libraries/System.Web.HttpUtility/ref/System.Web.HttpUtility.cs
index f319c25a30e7a6..c0c53799778f56 100644
--- a/src/libraries/System.Web.HttpUtility/ref/System.Web.HttpUtility.cs
+++ b/src/libraries/System.Web.HttpUtility/ref/System.Web.HttpUtility.cs
@@ -67,6 +67,6 @@ public static void HtmlEncode(string? s, System.IO.TextWriter output) { }
     }
     public partial interface IHtmlString
     {
-        string ToHtmlString();
+        string? ToHtmlString();
     }
 }
diff --git a/src/libraries/System.Web.HttpUtility/src/System/Web/IHtmlString.cs b/src/libraries/System.Web.HttpUtility/src/System/Web/IHtmlString.cs
index da6f3ce48bd3b7..a361603d14843d 100644
--- a/src/libraries/System.Web.HttpUtility/src/System/Web/IHtmlString.cs
+++ b/src/libraries/System.Web.HttpUtility/src/System/Web/IHtmlString.cs
@@ -8,6 +8,6 @@ public interface IHtmlString
     {
         /// <summary>Returns an HTML-encoded string.</summary>
         /// <returns>An HTML-encoded string.</returns>
-        string ToHtmlString();
+        string? ToHtmlString();
     }
 }