support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Shell/Standard/SafeGdiplusStartupToken.cs

@@ -0,0 +1,36 @@
+namespace Standard
+{
+    using Microsoft.Win32.SafeHandles;
+    using System;
+    using System.Diagnostics.CodeAnalysis;
+    using System.Runtime.ConstrainedExecution;
+
+    internal sealed class SafeGdiplusStartupToken : SafeHandleZeroOrMinusOneIsInvalid
+    {
+        private SafeGdiplusStartupToken() : base(true)
+        {
+        }
+
+        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
+        protected override bool ReleaseHandle()
+        {
+            return (Standard.NativeMethods.GdiplusShutdown(base.handle) == Standard.Status.Ok);
+        }
+
+        [SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode"), SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope"), SuppressMessage("Microsoft.Usage", "CA2201:DoNotRaiseReservedExceptionTypes")]
+        public static Standard.SafeGdiplusStartupToken Startup()
+        {
+            IntPtr ptr;
+            Standard.StartupOutput output;
+            Standard.SafeGdiplusStartupToken token = new Standard.SafeGdiplusStartupToken();
+            if (Standard.NativeMethods.GdiplusStartup(out ptr, new Standard.StartupInput(), out output) == Standard.Status.Ok)
+            {
+                token.handle = ptr;
+                return token;
+            }
+            token.Dispose();
+            throw new Exception("Unable to initialize GDI+");
+        }
+    }
+}
+