diff --git a/AxibugEmuOnline.Client/Assets/Script/AppMain/MsgBool.cs b/AxibugEmuOnline.Client/Assets/Script/AppMain/MsgBool.cs
index e3e9d3a..b151d79 100644
--- a/AxibugEmuOnline.Client/Assets/Script/AppMain/MsgBool.cs
+++ b/AxibugEmuOnline.Client/Assets/Script/AppMain/MsgBool.cs
@@ -6,7 +6,10 @@ public struct MsgBool
     public string ErrorMsg;
     public bool Value;
 
-    public override string ToString()
+    //low C# readonly
+	//public override readonly string ToString()
+
+	public override string ToString()
     {
         if (Value)
         {
@@ -33,12 +36,13 @@ public struct MsgBool
         return msgBool.Value;
     }
 
-    //public static implicit operator (bool, string)(MsgBool msgBool)
-    //{
-    //    return (msgBool.Value, msgBool.ErrorMsg);
-    //}
+	//low C# 
+	//public static implicit operator (bool, string)(MsgBool msgBool)
+	//{
+	//    return (msgBool.Value, msgBool.ErrorMsg);
+	//}
 
-    public static implicit operator string(MsgBool msgBool)
+	public static implicit operator string(MsgBool msgBool)
     {
         return msgBool.ToString();
     }
diff --git a/AxibugEmuOnline.Client/Assets/Script/AppMain/NesEmulator/NesControllerMapper.cs b/AxibugEmuOnline.Client/Assets/Script/AppMain/NesEmulator/NesControllerMapper.cs
index 461a11f..f60b903 100644
--- a/AxibugEmuOnline.Client/Assets/Script/AppMain/NesEmulator/NesControllerMapper.cs
+++ b/AxibugEmuOnline.Client/Assets/Script/AppMain/NesEmulator/NesControllerMapper.cs
@@ -137,8 +137,10 @@ namespace AxibugEmuOnline.Client
                 m_keyListener = Controller.GetKey(m_hostController.ControllerIndex, m_buttonType);
             }
         }
+		//low C# readonly
+		//public readonly struct KeyListener
 
-        public struct KeyListener
+		public struct KeyListener
         {
             private readonly KeyCode m_key;