diff --git a/.travis.yml b/.travis.yml
index 8c57085296041effcbbfee76e868e0eeb85c2407..f389d9472b4be640a5c024d959a7edc8f003bbbf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,6 +34,7 @@ matrix:
           - psmisc
           - unixodbc
           - unixodbc-dev
+          - mono-complete
 
     before_script:
       - export TZ=Asia/Harbin
@@ -74,6 +75,15 @@ matrix:
           ./valgrind-test.sh 2>&1 > mem-error-out.log
           sleep 1
 
+          cd ${TRAVIS_BUILD_DIR}/tests/examples/C#/taosdemo
+          mcs -output:taosdemo *.cs || travis_terminate $?
+          pkill -TERM -x taosd
+          fuser -k -n tcp 6030
+          sleep 1
+          taosd > /dev/null &
+          sleep 1
+          mono taosdemo -Q -y || travis_terminate $?
+
           # Color setting
           RED='\033[0;31m'
           GREEN='\033[1;32m'
diff --git a/tests/examples/C#/taosdemo/taosdemo.cs b/tests/examples/C#/taosdemo/taosdemo.cs
index 6e1cbd20886c28dcb6c361b95418a36f82bfe6b4..1d8daac9b968622dac09ed6c91713dd8554c7b7d 100644
--- a/tests/examples/C#/taosdemo/taosdemo.cs
+++ b/tests/examples/C#/taosdemo/taosdemo.cs
@@ -204,7 +204,7 @@ namespace TDengineDriver
                     String tmp = argv[i + 1];
                     if (tmp[0] == '-')
                     {
-                        Console.WriteLine("option {0:G} requires an argument", tmp);
+                        Console.WriteLine("option {0:G} requires an argument", argName);
                         ExitProgram();
                     }
 
@@ -236,7 +236,7 @@ namespace TDengineDriver
                     String tmp = argv[i + 1];
                     if (tmp[0] == '-')
                     {
-                        Console.WriteLine("option {0:G} requires an argument", tmp);
+                        Console.WriteLine("option {0:G} requires an argument", argName);
                         ExitProgram();
                     }
                     return tmp;