diff --git a/Realtime/LCApplicationRealtimeExt.cs b/Realtime/LCApplicationRealtimeExt.cs
index 73f48ad..e26d47e 100644
--- a/Realtime/LCApplicationRealtimeExt.cs
+++ b/Realtime/LCApplicationRealtimeExt.cs
@@ -6,13 +6,5 @@ using LeanCloud.Realtime.Internal;
 namespace LeanCloud {
     public static class LCApplicationRealtimeExt {
 
-        public static async Task<LCIMClient> CreateIMClient(this LCApplication application, string clientId) {
-            if (string.IsNullOrEmpty(clientId)) {
-                throw new ArgumentNullException(nameof(clientId));
-            }
-
-            LCIMClient client = new LCIMClient(clientId);
-            return client;
-        }
     }
 }
diff --git a/Test/RealtimeConsole/Program.cs b/Test/RealtimeConsole/Program.cs
index 6ec85c1..b0b4dda 100644
--- a/Test/RealtimeConsole/Program.cs
+++ b/Test/RealtimeConsole/Program.cs
@@ -12,7 +12,7 @@ namespace RealtimeConsole {
         public static void Main(string[] args) {
             Console.WriteLine("Hello World!");
 
-            Start();
+            _ = Start();
 
             Console.ReadKey(true);
         }