diff --git a/Bin/net40/SunnyUI.Demo.exe b/Bin/net40/SunnyUI.Demo.exe
index 003e9b33..74bc891c 100644
Binary files a/Bin/net40/SunnyUI.Demo.exe and b/Bin/net40/SunnyUI.Demo.exe differ
diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index 9f24cf9d..e21ee2ac 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/Bin/net462/SunnyUI.dll b/Bin/net462/SunnyUI.dll
index 6a3d2fe6..bc03ffae 100644
Binary files a/Bin/net462/SunnyUI.dll and b/Bin/net462/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/SunnyUI.dll b/Bin/net5.0-windows/SunnyUI.dll
index 7327b256..831569a9 100644
Binary files a/Bin/net5.0-windows/SunnyUI.dll and b/Bin/net5.0-windows/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/ref/SunnyUI.dll b/Bin/net5.0-windows/ref/SunnyUI.dll
index 751a0504..8629d6a1 100644
Binary files a/Bin/net5.0-windows/ref/SunnyUI.dll and b/Bin/net5.0-windows/ref/SunnyUI.dll differ
diff --git a/Bin/netcoreapp3.1/SunnyUI.dll b/Bin/netcoreapp3.1/SunnyUI.dll
index b1209297..77e91a47 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI/Controls/UIListBox.cs b/SunnyUI/Controls/UIListBox.cs
index 4e49ad5f..185a68e1 100644
--- a/SunnyUI/Controls/UIListBox.cs
+++ b/SunnyUI/Controls/UIListBox.cs
@@ -37,7 +37,7 @@ namespace Sunny.UI
 {
     [DefaultEvent("ItemClick")]
     [DefaultProperty("Items")]
-    public sealed partial class UIListBox : UIPanel, IToolTip
+    public sealed class UIListBox : UIPanel, IToolTip
     {
         private readonly ListBoxEx listbox = new ListBoxEx();
         private readonly UIScrollBar bar = new UIScrollBar();
diff --git a/SunnyUI/Static/UFile.cs b/SunnyUI/Static/UFile.cs
index a8eeda8c..49f00737 100644
--- a/SunnyUI/Static/UFile.cs
+++ b/SunnyUI/Static/UFile.cs
@@ -766,6 +766,25 @@ namespace Sunny.UI
             crc ^= 0xFFFFFFFF;
             return crc.ToString("X").PadLeft(8, '0');
         }
+
+        public static bool IsValidFileName(string name)
+        {
+            if (name.IsNullOrEmpty())
+            {
+                return false;
+            }
+
+            string[] errorStr = { "/", "\\", ":", ",", "*", "?", "\"", "<", ">", "|" };
+            foreach (var str in errorStr)
+            {
+                if (name.Contains(str))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
     }
 
     /// <summary>
diff --git a/SunnyUI/Units/UMMFile.cs b/SunnyUI/Units/UMMFile.cs
new file mode 100644
index 00000000..214012fd
--- /dev/null
+++ b/SunnyUI/Units/UMMFile.cs
@@ -0,0 +1,160 @@
+/******************************************************************************
+ * SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
+ * CopyRight (C) 2012-2021 ShenYongHua(沈永华).
+ * QQ群：56829229 QQ：17612584 EMail：SunnyUI@QQ.Com
+ *
+ * Blog:   https://www.cnblogs.com/yhuse
+ * Gitee:  https://gitee.com/yhuse/SunnyUI
+ * GitHub: https://github.com/yhuse/SunnyUI
+ *
+ * SunnyUI.dll can be used for free under the GPL-3.0 license.
+ * If you use this code, please keep this note.
+ * 如果您使用此代码，请保留此说明。
+ ******************************************************************************
+ * 文件名称: UMMFile.cs
+ * 文件说明: 多进程通信类
+ * 当前版本: V3.0
+ * 创建日期: 2021-09-05
+ *
+ * 2021-09-05: V3.0.6 增加文件说明
+******************************************************************************/
+
+using System;
+using System.IO.MemoryMappedFiles;
+using System.Text;
+using System.Threading;
+
+namespace Sunny.UI
+{
+    public sealed class MMFile : BackgroundWorkerEx, IDisposable
+    {
+        public string MapName { get; }
+        public int Capacity { get; }
+
+        public MMFile(string mapName, int capacity = 4096)
+        {
+            if (!FileEx.IsValidFileName(mapName))
+            {
+                throw new Exception("MapName is not valid.");
+            }
+
+            MapName = mapName;
+            WorkerDelay = 10;
+            Capacity = Math.Max(4096, capacity);
+
+            var mmf = MemoryMappedFile.CreateOrOpen(MapName, Capacity, MemoryMappedFileAccess.ReadWrite);
+            using (var accessor = mmf.CreateViewAccessor(0, Capacity))
+            {
+                var value = accessor.ReadBoolean(0);
+                if (!value) accessor.Write(0, false);
+            }
+        }
+
+        public event MMFileEventHandler OnMessage;
+
+        protected override void DoWorker()
+        {
+            try
+            {
+                if (ExistsValue())
+                {
+                    var message = Read();
+                    OnMessage?.Invoke(this, new MMFileEventArgs(message.Source, message.Value));
+                }
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine(e);
+            }
+        }
+
+        public void Write(string dest, string message)
+        {
+            var mmf = MemoryMappedFile.CreateOrOpen(dest, Capacity, MemoryMappedFileAccess.ReadWrite);
+            using (var accessor = mmf.CreateViewAccessor(0, Capacity))
+            {
+                if (accessor.ReadBoolean(0))
+                {
+                    Thread.Sleep(10);
+                }
+
+                var data = Encoding.Unicode.GetBytes(MapName);
+                accessor.Write(128, data.Length);
+                accessor.WriteArray(128 + 4, data, 0, data.Length);
+
+                data = Encoding.Unicode.GetBytes(message);
+                accessor.Write(1024, data.Length);
+                accessor.WriteArray(1024 + 4, data, 0, data.Length);
+
+                accessor.Write(0, true);
+            }
+        }
+
+        private Message Read()
+        {
+            Message message = new Message();
+            var mmf = MemoryMappedFile.CreateOrOpen(MapName, Capacity, MemoryMappedFileAccess.ReadWrite);
+            using (var accessor = mmf.CreateViewAccessor(0, Capacity))
+            {
+                accessor.Write(0, false);
+                var len = accessor.ReadInt32(128);
+                var data = new byte[len];
+                accessor.ReadArray(128 + 4, data, 0, len);
+                message.Source = Encoding.Unicode.GetString(data);
+
+                len = accessor.ReadInt32(1024);
+                data = new byte[len];
+                accessor.ReadArray(1024 + 4, data, 0, len);
+                message.Value = Encoding.Unicode.GetString(data);
+                return message;
+            }
+        }
+
+        private bool ExistsValue()
+        {
+            var mmf = MemoryMappedFile.CreateOrOpen(MapName, Capacity, MemoryMappedFileAccess.ReadWrite);
+            using (var accessor = mmf.CreateViewAccessor(0, Capacity))
+            {
+                return accessor.ReadBoolean(0);
+            }
+        }
+
+        internal struct Message
+        {
+            public string Source { get; set; }
+            public string Value { get; set; }
+        }
+
+        public void Dispose()
+        {
+            Stop();
+            try
+            {
+                var mmf = MemoryMappedFile.OpenExisting(MapName);
+                mmf.Dispose();
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine(e);
+            }
+        }
+
+        ~MMFile()
+        {
+            Dispose();
+        }
+    }
+
+    public delegate void MMFileEventHandler(object sender, MMFileEventArgs e);
+    public class MMFileEventArgs : EventArgs
+    {
+        public string Source { get; set; }
+        public string Value { get; set; }
+
+        public MMFileEventArgs(string source, string value)
+        {
+            Source = source;
+            Value = value;
+        }
+    }
+}
\ No newline at end of file