diff --git a/CPF.Windows/GDIPlus/Extension.cs b/CPF.Windows/GDIPlus/Extension.cs
index acb1cf3..ca58a8f 100644
--- a/CPF.Windows/GDIPlus/Extension.cs
+++ b/CPF.Windows/GDIPlus/Extension.cs
@@ -1,4 +1,4 @@
-//#if Net4
+#if Net4
 using System;
 using System.Collections.Generic;
 using System.Text;
@@ -83,4 +83,4 @@ namespace CPF.GDIPlus
         }
     }
 }
-//#endif
\ No newline at end of file
+#endif
\ No newline at end of file
diff --git a/CPF.Windows/GDIPlus/GDIPlusBitmap.cs b/CPF.Windows/GDIPlus/GDIPlusBitmap.cs
index 0b97599..28dfea2 100644
--- a/CPF.Windows/GDIPlus/GDIPlusBitmap.cs
+++ b/CPF.Windows/GDIPlus/GDIPlusBitmap.cs
@@ -1,4 +1,4 @@
-//#if Net4
+#if Net4
 using System;
 using System.Collections.Generic;
 using System.IO;
@@ -91,4 +91,4 @@ namespace CPF.GDIPlus
         }
     }
 }
-//#endif
\ No newline at end of file
+#endif
\ No newline at end of file
diff --git a/CPF.Windows/GDIPlus/GDIPlusBitmapLock.cs b/CPF.Windows/GDIPlus/GDIPlusBitmapLock.cs
index a9a90b9..6ecfd26 100644
--- a/CPF.Windows/GDIPlus/GDIPlusBitmapLock.cs
+++ b/CPF.Windows/GDIPlus/GDIPlusBitmapLock.cs
@@ -1,4 +1,4 @@
-//#if Net4
+#if Net4
 using System;
 using System.Collections.Generic;
 using System.Text;
@@ -166,4 +166,4 @@ namespace CPF.GDIPlus
         }
     }
 }
-//#endif
\ No newline at end of file
+#endif
\ No newline at end of file
diff --git a/CPF.Windows/GDIPlus/GDIPlusDrawingContext.cs b/CPF.Windows/GDIPlus/GDIPlusDrawingContext.cs
index 0b9cbc3..95850b7 100644
--- a/CPF.Windows/GDIPlus/GDIPlusDrawingContext.cs
+++ b/CPF.Windows/GDIPlus/GDIPlusDrawingContext.cs
@@ -1,4 +1,4 @@
-//#if Net4
+#if Net4
 using System;
 using System.Collections.Generic;
 using System.Text;
@@ -802,4 +802,4 @@ namespace CPF.GDIPlus
 
 
 }
-//#endif
\ No newline at end of file
+#endif
\ No newline at end of file
diff --git a/CPF.Windows/GDIPlus/GDIPlusDrawingFactory.cs b/CPF.Windows/GDIPlus/GDIPlusDrawingFactory.cs
index 7b3cba5..746ea9b 100644
--- a/CPF.Windows/GDIPlus/GDIPlusDrawingFactory.cs
+++ b/CPF.Windows/GDIPlus/GDIPlusDrawingFactory.cs
@@ -1,4 +1,4 @@
-//#if Net4
+#if Net4
 using CPF.Platform;
 using System;
 using System.Collections.Generic;
@@ -334,4 +334,4 @@ namespace CPF.GDIPlus
         }
     }
 }
-//#endif
\ No newline at end of file
+#endif
\ No newline at end of file
diff --git a/CPF.Windows/GDIPlus/GDIPlusImage.cs b/CPF.Windows/GDIPlus/GDIPlusImage.cs
index 04d25f0..e112c92 100644
--- a/CPF.Windows/GDIPlus/GDIPlusImage.cs
+++ b/CPF.Windows/GDIPlus/GDIPlusImage.cs
@@ -1,4 +1,4 @@
-//#if Net4
+#if Net4
 using System;
 using System.Collections.Generic;
 using System.Drawing;
@@ -255,4 +255,4 @@ namespace CPF.GDIPlus
         }
     }
 }
-//#endif
\ No newline at end of file
+#endif
\ No newline at end of file
diff --git a/CPF.Windows/GDIPlus/GDIPlusPath.cs b/CPF.Windows/GDIPlus/GDIPlusPath.cs
index 0991415..37c1dd1 100644
--- a/CPF.Windows/GDIPlus/GDIPlusPath.cs
+++ b/CPF.Windows/GDIPlus/GDIPlusPath.cs
@@ -1,4 +1,4 @@
-//#if Net4
+#if Net4
 using System;
 using System.Collections.Generic;
 using System.Drawing.Drawing2D;
@@ -304,4 +304,4 @@ namespace CPF.GDIPlus
         }
     }
 }
-//#endif
\ No newline at end of file
+#endif
\ No newline at end of file
diff --git a/CPF.Windows/GDIPlus/GDIPlusPathGeometry.cs b/CPF.Windows/GDIPlus/GDIPlusPathGeometry.cs
index a844e13..79f70b4 100644
--- a/CPF.Windows/GDIPlus/GDIPlusPathGeometry.cs
+++ b/CPF.Windows/GDIPlus/GDIPlusPathGeometry.cs
@@ -1,4 +1,4 @@
-//#if Net4
+#if Net4
 using System;
 using System.Collections.Generic;
 using System.Text;
@@ -70,4 +70,4 @@ namespace CPF.GDIPlus
 
     }
 }
-//#endif
\ No newline at end of file
+#endif
\ No newline at end of file