diff --git a/test/TensorFlowNET.Examples/ImageRecognition.cs b/test/TensorFlowNET.Examples/ImageRecognition.cs
index acc8c1d9..445fa38e 100644
--- a/test/TensorFlowNET.Examples/ImageRecognition.cs
+++ b/test/TensorFlowNET.Examples/ImageRecognition.cs
@@ -14,8 +14,7 @@ namespace TensorFlowNET.Examples
         public void Run()
         {
             var graph = new Graph();
-            // 从文件加载序列化的GraphDef
-            //导入GraphDef
+            //import GraphDef from pb file
             graph.Import("tmp/tensorflow_inception_graph.pb");
             with<Session>(tf.Session(graph), sess =>
             {
diff --git a/test/TensorFlowNET.UnitTest/ConstantTest.cs b/test/TensorFlowNET.UnitTest/ConstantTest.cs
index b3e222a2..49298493 100644
--- a/test/TensorFlowNET.UnitTest/ConstantTest.cs
+++ b/test/TensorFlowNET.UnitTest/ConstantTest.cs
@@ -103,10 +103,11 @@ namespace TensorFlowNET.UnitTest
         public void StringEncode()
         {
             string str = "Hello, TensorFlow.NET!";
+            var handle = Marshal.StringToHGlobalAnsi(str);
             ulong dst_len = c_api.TF_StringEncodedSize((ulong)str.Length);
             Assert.AreEqual(dst_len, (ulong)23);
             IntPtr dst = Marshal.AllocHGlobal((int)dst_len);
-            ulong encoded_len = c_api.TF_StringEncode(str, (ulong)str.Length, dst, dst_len, status);
+            ulong encoded_len = c_api.TF_StringEncode(handle, (ulong)str.Length, dst, dst_len, status);
             Assert.AreEqual((ulong)23, encoded_len);
             Assert.AreEqual(status.Code, TF_Code.TF_OK);
             string encoded_str = Marshal.PtrToStringUTF8(dst + sizeof(byte));