diff --git a/.gitignore b/.gitignore
index ca1c7a3..d62d4cb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,9 @@
 # User-specific files (MonoDevelop/Xamarin Studio)
 *.userprefs
 
+# dll files
+*.dll
+
 # Mono auto generated files
 mono_crash.*
 
diff --git a/AutomobilePlant/ImplementationExtensions/AutomobilePlantContracts.dll b/AutomobilePlant/ImplementationExtensions/AutomobilePlantContracts.dll
deleted file mode 100644
index 3432b33..0000000
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diff --git a/AutomobilePlant/ImplementationExtensions/AutomobilePlantDataModels.dll b/AutomobilePlant/ImplementationExtensions/AutomobilePlantDataModels.dll
deleted file mode 100644
index 6e02030..0000000
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diff --git a/AutomobilePlant/ImplementationExtensions/AutomobilePlantFileImplement.dll b/AutomobilePlant/ImplementationExtensions/AutomobilePlantFileImplement.dll
deleted file mode 100644
index 5acc331..0000000
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diff --git a/AutomobilePlant/ImplementationExtensions/AutomobilePlantListImplement.dll b/AutomobilePlant/ImplementationExtensions/AutomobilePlantListImplement.dll
deleted file mode 100644
index c379df1..0000000
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