diff --git a/src/AddIns/BackendBindings/VBNetBinding/Project/Src/FormattingStrategy/VBNetFormattingStrategy.cs b/src/AddIns/BackendBindings/VBNetBinding/Project/Src/FormattingStrategy/VBNetFormattingStrategy.cs
index f1a315456b..ea9f3c51d9 100644
--- a/src/AddIns/BackendBindings/VBNetBinding/Project/Src/FormattingStrategy/VBNetFormattingStrategy.cs
+++ b/src/AddIns/BackendBindings/VBNetBinding/Project/Src/FormattingStrategy/VBNetFormattingStrategy.cs
@@ -646,7 +646,10 @@ namespace ICSharpCode.VBNetBinding
 			for (int i = blockStart; i <= blockEnd; i++) {
 				IDocumentLine curLine = editor.Document.GetLine(i);
 				string lineText = curLine.Text.TrimStart();
-				string noComments = lineText.TrimComments().TrimEnd();
+				// preprocessor directives cannot be multiline (just as comments)
+				// and they are not included in normal block indentation ->
+				// treat preprocessor directives as comments -> remove them
+				string noComments = lineText.TrimComments().TrimPreprocessorDirectives().TrimEnd();
 				
 				// adjust indentation if the current line is not selected
 				// lines between the selection will be aligned to the selected level
diff --git a/src/AddIns/BackendBindings/VBNetBinding/Project/Src/LanguageUtils.cs b/src/AddIns/BackendBindings/VBNetBinding/Project/Src/LanguageUtils.cs
index 3677dfd1de..527b9c43ee 100644
--- a/src/AddIns/BackendBindings/VBNetBinding/Project/Src/LanguageUtils.cs
+++ b/src/AddIns/BackendBindings/VBNetBinding/Project/Src/LanguageUtils.cs
@@ -26,6 +26,29 @@ namespace ICSharpCode.VBNetBinding
 			return line;
 		}
 		
+		public static string TrimPreprocessorDirectives(this string line)
+		{
+			if (string.IsNullOrEmpty(line))
+				return string.Empty;
+			
+			bool inStr = false;
+			bool wsOnly = true;
+			
+			for (int i = 0; i < line.Length; i++) {
+				if (line[i] == '#' && wsOnly) {
+					if (i < line.Length - 1) {
+						if (char.IsLetter(line[i + 1]))
+							return line.Substring(0, i);
+					} else
+						return line.Substring(0, i);
+				}
+				if (!char.IsWhiteSpace(line[i]))
+					wsOnly = false;
+			}
+			
+			return line;
+		}
+		
 		public static string TrimLine(this string line)
 		{
 			if (string.IsNullOrEmpty(line))
diff --git a/src/AddIns/BackendBindings/VBNetBinding/Test/FormattingStrategy/IndentationTests.cs b/src/AddIns/BackendBindings/VBNetBinding/Test/FormattingStrategy/IndentationTests.cs
index 2394108efb..32cd42061f 100644
--- a/src/AddIns/BackendBindings/VBNetBinding/Test/FormattingStrategy/IndentationTests.cs
+++ b/src/AddIns/BackendBindings/VBNetBinding/Test/FormattingStrategy/IndentationTests.cs
@@ -454,6 +454,32 @@ End Class";
 			RunFormatTest(code, expected);
 		}
 		
+		[Test]
+		public void Region()
+		{
+			string expected = @"Module Program
+	#Region Test
+	
+	#End Region
+	
+	Sub asdf()
+		
+	End Sub
+End Module";
+			
+			string code = @"Module Program
+#Region Test
+
+#End Region
+
+Sub asdf()
+
+End Sub
+End Module";
+			
+			RunFormatTest(code, expected);
+		}
+		
 		void RunFormatTest(string code, string expectedCode)
 		{
 			AvalonEditTextEditorAdapter editor = new AvalonEditTextEditorAdapter(new TextEditor());
diff --git a/src/AddIns/BackendBindings/VBNetBinding/Test/LanguageUtilsTests.cs b/src/AddIns/BackendBindings/VBNetBinding/Test/LanguageUtilsTests.cs
new file mode 100644
index 0000000000..407777e83e
--- /dev/null
+++ b/src/AddIns/BackendBindings/VBNetBinding/Test/LanguageUtilsTests.cs
@@ -0,0 +1,72 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using NUnit.Framework;
+
+namespace ICSharpCode.VBNetBinding.Tests
+{
+	[TestFixture]
+	public class LanguageUtilsTests
+	{
+		[Test]
+		public void TrimPreprocessorDirectives1()
+		{
+			string input = "			#Region Test";
+			string expectedOutput = "			";
+			
+			TestTrimPreprocessorDirectives(input, expectedOutput);
+		}
+		
+		[Test]
+		public void TrimPreprocessorDirectives2()
+		{
+			string input = "Dim a# = 12.0";
+			string expectedOutput = "Dim a# = 12.0";
+			
+			TestTrimPreprocessorDirectives(input, expectedOutput);
+		}
+		
+		[Test]
+		public void TrimPreprocessorDirectives3()
+		{
+			string input = "Dim a = 12.0#";
+			string expectedOutput = "Dim a = 12.0#";
+			
+			TestTrimPreprocessorDirectives(input, expectedOutput);
+		}
+		
+		[Test]
+		public void TrimPreprocessorDirectives4()
+		{
+			string input = "		#10/10/2010#";
+			string expectedOutput = "		#10/10/2010#";
+			
+			TestTrimPreprocessorDirectives(input, expectedOutput);
+		}
+		
+		[Test]
+		public void TrimPreprocessorDirectives5()
+		{
+			string input = "Dim a = 12.0#  ";
+			string expectedOutput = "Dim a = 12.0#  ";
+			
+			TestTrimPreprocessorDirectives(input, expectedOutput);
+		}
+		
+		[Test]
+		public void TrimPreprocessorDirectives6()
+		{
+			string input = "		#10/10/2010#  ";
+			string expectedOutput = "		#10/10/2010#  ";
+			
+			TestTrimPreprocessorDirectives(input, expectedOutput);
+		}
+		
+		void TestTrimPreprocessorDirectives(string input, string expectedOutput)
+		{
+			string output = LanguageUtils.TrimPreprocessorDirectives(input);
+			Assert.AreEqual(expectedOutput, output);
+		}
+	}
+}
diff --git a/src/AddIns/BackendBindings/VBNetBinding/Test/VBNetBinding.Tests.csproj b/src/AddIns/BackendBindings/VBNetBinding/Test/VBNetBinding.Tests.csproj
index 37d42030d2..fdedcb7e74 100644
--- a/src/AddIns/BackendBindings/VBNetBinding/Test/VBNetBinding.Tests.csproj
+++ b/src/AddIns/BackendBindings/VBNetBinding/Test/VBNetBinding.Tests.csproj
@@ -56,6 +56,7 @@
     </Reference>
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="LanguageUtilsTests.cs" />
     <Compile Include="MockTextEditor.cs" />
     <Compile Include="TextEditorBasedTests.cs" />
     <ProjectReference Include="..\..\..\..\Libraries\AvalonEdit\ICSharpCode.AvalonEdit\ICSharpCode.AvalonEdit.csproj">