diff --git a/Enyim.Caching/Enyim.Caching.csproj b/Enyim.Caching/Enyim.Caching.csproj
index 6cdfecc9..12ef1c32 100755
--- a/Enyim.Caching/Enyim.Caching.csproj
+++ b/Enyim.Caching/Enyim.Caching.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <Description>EnyimMemcachedCore is a Memcached client library for .NET Core. Usage: Add services.AddEnyimMemcached(...) and app.UseEnyimMemcached() in Startup. Add IMemcachedClient into constructor.</Description>
-    <VersionPrefix>2.1.0</VersionPrefix>
+    <VersionPrefix>2.1.0.1</VersionPrefix>
     <Authors>cnblogs.com</Authors>
     <TargetFramework>netstandard2.0</TargetFramework>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
diff --git a/Enyim.Caching/IMemcachedClient.cs b/Enyim.Caching/IMemcachedClient.cs
index 136780c0..1aebbfeb 100644
--- a/Enyim.Caching/IMemcachedClient.cs
+++ b/Enyim.Caching/IMemcachedClient.cs
@@ -11,6 +11,9 @@ public interface IMemcachedClient : IDisposable
         void Add(string key, object value, int cacheSeconds);
         Task AddAsync(string key, object value, int cacheSeconds);
 
+        void Set(string key, object value, int cacheSeconds);
+        Task SetAsync(string key, object value, int cacheSeconds);
+
         Task<IGetOperationResult<T>> GetAsync<T>(string key);
         Task<T> GetValueAsync<T>(string key);
         object Get(string key);
diff --git a/Enyim.Caching/MemcachedClient.cs b/Enyim.Caching/MemcachedClient.cs
index 000b2403..64aa05f7 100755
--- a/Enyim.Caching/MemcachedClient.cs
+++ b/Enyim.Caching/MemcachedClient.cs
@@ -98,6 +98,16 @@ public async Task AddAsync(string key, object value, int cacheSeconds)
             await StoreAsync(StoreMode.Add, key, value, new TimeSpan(0, 0, cacheSeconds));
         }
 
+        public void Set(string key, object value, int cacheSeconds)
+        {
+            Store(StoreMode.Set, key, value, new TimeSpan(0, 0, cacheSeconds));
+        }
+
+        public async Task SetAsync(string key, object value, int cacheSeconds)
+        {
+            await StoreAsync(StoreMode.Set, key, value, new TimeSpan(0, 0, cacheSeconds));
+        }
+
         /// <summary>
         /// Retrieves the specified item from the cache.
         /// </summary>
diff --git a/Enyim.Caching/NullMemcachedClient.cs b/Enyim.Caching/NullMemcachedClient.cs
index b252836c..cdfc2744 100644
--- a/Enyim.Caching/NullMemcachedClient.cs
+++ b/Enyim.Caching/NullMemcachedClient.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Net;
 using System.Text;
 using System.Threading.Tasks;
 using Enyim.Caching.Memcached;
@@ -40,37 +41,37 @@ public CasResult<bool> Cas(StoreMode mode, string key, object value, TimeSpan va
 
         public CasResult<bool> Cas(StoreMode mode, string key, object value, DateTime expiresAt, ulong cas)
         {
-            throw new NotImplementedException();
+            return new CasResult<bool>();
         }
 
         public ulong Decrement(string key, ulong defaultValue, ulong delta)
         {
-            throw new NotImplementedException();
+            return default(ulong);
         }
 
         public ulong Decrement(string key, ulong defaultValue, ulong delta, TimeSpan validFor)
         {
-            throw new NotImplementedException();
+            return default(ulong);
         }
 
         public CasResult<ulong> Decrement(string key, ulong defaultValue, ulong delta, ulong cas)
         {
-            throw new NotImplementedException();
+            return new CasResult<ulong>();
         }
 
         public ulong Decrement(string key, ulong defaultValue, ulong delta, DateTime expiresAt)
         {
-            throw new NotImplementedException();
+            return default(ulong);
         }
 
         public CasResult<ulong> Decrement(string key, ulong defaultValue, ulong delta, TimeSpan validFor, ulong cas)
         {
-            throw new NotImplementedException();
+            return new CasResult<ulong>();
         }
 
         public CasResult<ulong> Decrement(string key, ulong defaultValue, ulong delta, DateTime expiresAt, ulong cas)
         {
-            throw new NotImplementedException();
+            return new CasResult<ulong>();
         }
 
         public void Dispose()
@@ -118,57 +119,57 @@ public async Task<T> GetValueAsync<T>(string key)
 
         public IDictionary<string, CasResult<object>> GetWithCas(IEnumerable<string> keys)
         {
-            throw new NotImplementedException();
+            return new Dictionary<string, CasResult<object>>();
         }
 
         public CasResult<object> GetWithCas(string key)
         {
-            throw new NotImplementedException();
+            return new CasResult<object>();
         }
 
         public CasResult<T> GetWithCas<T>(string key)
         {
-            throw new NotImplementedException();
+            return new CasResult<T>();
         }
 
         public ulong Increment(string key, ulong defaultValue, ulong delta)
         {
-            throw new NotImplementedException();
+            return default(ulong);
         }
 
         public ulong Increment(string key, ulong defaultValue, ulong delta, TimeSpan validFor)
         {
-            throw new NotImplementedException();
+            return default(ulong);
         }
 
         public CasResult<ulong> Increment(string key, ulong defaultValue, ulong delta, ulong cas)
         {
-            throw new NotImplementedException();
+            return new CasResult<ulong>();
         }
 
         public ulong Increment(string key, ulong defaultValue, ulong delta, DateTime expiresAt)
         {
-            throw new NotImplementedException();
+            return default(ulong);
         }
 
         public CasResult<ulong> Increment(string key, ulong defaultValue, ulong delta, TimeSpan validFor, ulong cas)
         {
-            throw new NotImplementedException();
+            return new CasResult<ulong>();
         }
 
         public CasResult<ulong> Increment(string key, ulong defaultValue, ulong delta, DateTime expiresAt, ulong cas)
         {
-            throw new NotImplementedException();
+            return new CasResult<ulong>();
         }
 
         public bool Prepend(string key, ArraySegment<byte> data)
         {
-            throw new NotImplementedException();
+            return false;
         }
 
         public CasResult<bool> Prepend(string key, ulong cas, ArraySegment<byte> data)
         {
-            throw new NotImplementedException();
+            return new CasResult<bool>();
         }
 
         public bool Remove(string key)
@@ -176,14 +177,14 @@ public bool Remove(string key)
             return true;
         }
 
-        public async Task<bool> RemoveAsync(string key)
+        public Task<bool> RemoveAsync(string key)
         {
-            return true;
+            return Task.FromResult<bool>(false);
         }
 
         public ServerStats Stats()
         {
-            throw new NotImplementedException();
+            return new ServerStats(new Dictionary<EndPoint, Dictionary<string, string>>());
         }
 
         public ServerStats Stats(string type)
@@ -218,20 +219,33 @@ public bool Store(StoreMode mode, string key, object value, DateTime expiresAt)
 
         public bool TryGet(string key, out object value)
         {
-            throw new NotImplementedException();
+            value = null;
+            return false;
         }
 
         public bool TryGetWithCas(string key, out CasResult<object> value)
         {
-            throw new NotImplementedException();
+            value = new CasResult<object>();
+            return false;
         }
 
         public void Add(string key, object value, int cacheSeconds)
         {
         }
 
-        public async Task AddAsync(string key, object value, int cacheSeconds)
+        public Task AddAsync(string key, object value, int cacheSeconds)
+        {
+            return Task.CompletedTask;
+        }
+
+        public void Set(string key, object value, int cacheSeconds)
+        {
+
+        }
+
+        public Task SetAsync(string key, object value, int cacheSeconds)
         {
+            return Task.CompletedTask;
         }
     }
 }