diff --git a/csharp/.gitignore b/csharp/.gitignore
new file mode 100644
index 0000000..76c414f
--- /dev/null
+++ b/csharp/.gitignore
@@ -0,0 +1,40 @@
+#
+# 	Untracked directories
+#
+src/AddressBook/bin
+src/AddressBook/obj
+src/ProtocolBuffers/bin/
+src/ProtocolBuffers/obj/
+src/ProtocolBuffers/objCF
+src/ProtocolBuffers.Test/bin/
+src/ProtocolBuffers.Test/obj/
+src/ProtocolBuffersLite.Test/bin/
+src/ProtocolBuffersLite.Test/obj/
+src/ProtoBench/bin/
+src/ProtoBench/obj/
+src/ProtoDump/bin/
+src/ProtoDump/obj/
+src/ProtoGen/bin/
+src/ProtoGen/obj/
+src/ProtoGen.Test/bin/
+src/ProtoGen.Test/obj/
+src/ProtoMunge/bin/
+src/ProtoMunge/obj/
+mono/bin
+mono/tmp
+mono/protoc
+build_output
+build_temp
+build/msbuild*.log
+
+#
+# 	Untracked files
+#
+*.user
+*.suo
+_ReSharper.*
+*.sln.cache
+mono/TestResult.xml
+mono/.libs
+mono/*.exe
+mono/*.dll