diff --git a/VipNetExtract2/VipNetExtract.csproj b/VipNetExtract2/VipNetExtract.csproj
index 33b41a6..5718e07 100644
--- a/VipNetExtract2/VipNetExtract.csproj
+++ b/VipNetExtract2/VipNetExtract.csproj
@@ -42,7 +42,6 @@
     <Reference Include="System" />
     <Reference Include="System.Core" />
     <Reference Include="System.Xml.Linq" />
-    <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />