diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index 36d05f2b..9fac7c25 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 9ce2f3f0..3e56af6d 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 2d857f95..a9a75422 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 a9f45616..831d46ac 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 203fda07..94a868bc 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI/Controls/DropItem/UIDropControl.cs b/SunnyUI/Controls/DropItem/UIDropControl.cs
index 864ea5bc..7b679286 100644
--- a/SunnyUI/Controls/DropItem/UIDropControl.cs
+++ b/SunnyUI/Controls/DropItem/UIDropControl.cs
@@ -149,6 +149,14 @@ namespace Sunny.UI
             set => edit.Watermark = value;
         }
 
+        [DefaultValue(typeof(Color), "Gray")]
+        [Description("水印文字颜色"), Category("SunnyUI")]
+        public Color WatermarkColor
+        {
+            get => edit.WaterMarkColor;
+            set => edit.WaterMarkColor = value;
+        }
+
         private UIDropDown itemForm;
 
         protected UIDropDown ItemForm
@@ -174,7 +182,7 @@ namespace Sunny.UI
 
         private void ItemForm_Closed(object sender, ToolStripDropDownClosedEventArgs e)
         {
-            DropDownClosed?.Invoke(this, null);
+            DropDownClosed?.Invoke(this, EventArgs.Empty);
         }
 
         private void ItemForm_VisibleChanged(object sender, EventArgs e)
@@ -190,7 +198,7 @@ namespace Sunny.UI
         }
 
         [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
-        public bool DroppedDown => itemForm != null && itemForm.Visible;
+        public bool DroppedDown => itemForm is { Visible: true };
 
         private int symbolNormal = 61703;
         private int dropSymbol = 61703;
@@ -244,7 +252,7 @@ namespace Sunny.UI
 
         public event EventHandler ButtonClick;
 
-        protected readonly TextBoxEx edit = new TextBoxEx();
+        protected readonly UIEdit edit = new UIEdit();
 
         protected override void OnTextChanged(EventArgs e)
         {
@@ -297,7 +305,7 @@ namespace Sunny.UI
             {
                 base.OnPaintFore(g, path);
                 g.FillRoundRectangle(GetFillColor(), new Rectangle(Width - 27, edit.Top, 26, edit.Height), Radius, false);
-                g.DrawRoundRectangle(rectColor, new Rectangle(0, 0, Width, Height), Radius, true);
+                g.DrawRoundRectangle(rectColor, new Rectangle(0, 0, Width, Height), Radius);
             }
 
             g.FillRoundRectangle(GetFillColor(), new Rectangle(Width - 27, edit.Top, 25, edit.Height), Radius);
@@ -435,21 +443,5 @@ namespace Sunny.UI
         {
             edit.SelectAll();
         }
-
-        protected class TextBoxEx : TextBox
-        {
-            private string watermark;
-
-            [DefaultValue(null)]
-            public string Watermark
-            {
-                get => watermark;
-                set
-                {
-                    watermark = value;
-                    Win32.User.SendMessage(Handle, 0x1501, (int)IntPtr.Zero, value);
-                }
-            }
-        }
     }
 }
\ No newline at end of file