diff --git a/websocket-sharp/Server/WebSocketBehavior.cs b/websocket-sharp/Server/WebSocketBehavior.cs
index 1bb7f519..9dac4fad 100644
--- a/websocket-sharp/Server/WebSocketBehavior.cs
+++ b/websocket-sharp/Server/WebSocketBehavior.cs
@@ -539,6 +539,66 @@ namespace WebSocketSharp.Server
       _websocket.Close (code, reason);
     }
 
+    /// <summary>
+    /// Closes the WebSocket connection for a session with the specified
+    /// code and reason.
+    /// </summary>
+    /// <remarks>
+    /// This method does nothing if the current state of the connection is
+    /// Closing or Closed.
+    /// </remarks>
+    /// <param name="code">
+    ///   <para>
+    ///   One of the <see cref="CloseStatusCode"/> enum values.
+    ///   </para>
+    ///   <para>
+    ///   It represents the status code indicating the reason for the close.
+    ///   </para>
+    /// </param>
+    /// <param name="reason">
+    ///   <para>
+    ///   A <see cref="string"/> that represents the reason for the close.
+    ///   </para>
+    ///   <para>
+    ///   The size must be 123 bytes or less in UTF-8.
+    ///   </para>
+    /// </param>
+    /// <exception cref="InvalidOperationException">
+    /// The session has not started yet.
+    /// </exception>
+    /// <exception cref="ArgumentOutOfRangeException">
+    /// The size of <paramref name="reason"/> is greater than 123 bytes.
+    /// </exception>
+    /// <exception cref="ArgumentException">
+    ///   <para>
+    ///   <paramref name="code"/> is
+    ///   <see cref="CloseStatusCode.MandatoryExtension"/>.
+    ///   </para>
+    ///   <para>
+    ///   -or-
+    ///   </para>
+    ///   <para>
+    ///   <paramref name="code"/> is
+    ///   <see cref="CloseStatusCode.NoStatus"/> and there is
+    ///   <paramref name="reason"/>.
+    ///   </para>
+    ///   <para>
+    ///   -or-
+    ///   </para>
+    ///   <para>
+    ///   <paramref name="reason"/> could not be UTF-8-encoded.
+    ///   </para>
+    /// </exception>
+    protected void Close (CloseStatusCode code, string reason)
+    {
+      if (_websocket == null) {
+        var msg = "The session has not started yet.";
+        throw new InvalidOperationException (msg);
+      }
+
+      _websocket.Close (code, reason);
+    }
+
     /// <summary>
     /// Calls the <see cref="OnError"/> method with the specified message.
     /// </summary>