diff --git a/README.md b/README.md
index 853b87f32..3310e6987 100644
--- a/README.md
+++ b/README.md
@@ -56,3 +56,11 @@ two ways to build the various samples:
     'Novell\Novell.MonoDroid.Common.targets'.
 
     topdir is also used to find the MonoDroid Install directory.
+
+Contributing
+------------
+
+Before adding a sample to the repository, please run either install-hook.bat
+or install-hook.sh depending on whether you're on Windows or a Posix system.
+This will install a Git hook that runs the Xamarin code sample validator before
+a commit, to ensure that all samples are good to go.
diff --git a/Xamarin.Edu.SampleGallery.Core.dll b/Xamarin.Edu.SampleGallery.Core.dll
new file mode 100644
index 000000000..1781126b4
Binary files /dev/null and b/Xamarin.Edu.SampleGallery.Core.dll differ
diff --git a/install-hook.bat b/install-hook.bat
new file mode 100644
index 000000000..72abfb4bf
--- /dev/null
+++ b/install-hook.bat
@@ -0,0 +1 @@
+copy pre-commit.windows .git\hooks\pre-commit
diff --git a/install-hook.sh b/install-hook.sh
new file mode 100644
index 000000000..a755d79a9
--- /dev/null
+++ b/install-hook.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+cp pre-commit.posix .git/hooks/pre-commit
diff --git a/pre-commit.posix b/pre-commit.posix
new file mode 100644
index 000000000..cb3c9bc86
--- /dev/null
+++ b/pre-commit.posix
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+for dir in `find . -type d -maxdepth 1`; do
+    mono --debug xcsv.exe $dir;
+
+    if [ $? != 0 ]; then
+        exit 1;
+    fi;
+done;
diff --git a/pre-commit.windows b/pre-commit.windows
new file mode 100644
index 000000000..d11dd5cf4
--- /dev/null
+++ b/pre-commit.windows
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+for dir in `find . -type d -maxdepth 1`; do
+    xcsv.exe $dir;
+
+    if [ $? != 0 ]; then
+        exit 1;
+    fi;
+done;
diff --git a/xcsv.exe b/xcsv.exe
new file mode 100644
index 000000000..9f34f4007
Binary files /dev/null and b/xcsv.exe differ