Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -14,6 +14,7 @@
 
 #include "UnwrappedLineParser.h"
 #include "FormatToken.h"
+#include "clang/Basic/TokenKinds.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
@@ -2216,7 +2217,7 @@
     parseParens();
   } else {
     while (FormatTok->isOneOf(tok::identifier, tok::coloncolon, tok::kw_inline,
-                              tok::l_square)) {
+                              tok::l_square, tok::period)) {
       if (FormatTok->is(tok::l_square))
         parseSquare();
       else
Index: clang/unittests/Format/FormatTestCSharp.cpp
===================================================================
--- clang/unittests/Format/FormatTestCSharp.cpp
+++ clang/unittests/Format/FormatTestCSharp.cpp
@@ -1314,5 +1314,26 @@
                Style);
 }
 
+TEST_F(FormatTestCSharp, NamespaceIndentation) {
+  FormatStyle Style = getMicrosoftStyle(FormatStyle::LK_CSharp);
+  Style.NamespaceIndentation = FormatStyle::NI_None;
+
+    verifyFormat("namespace A\n"
+              "{\n"
+               "public interface Name1\n"
+               "{\n"
+               "}\n"
+               "}\n",
+               Style);
+    
+    verifyFormat("namespace A.B\n"
+              "{\n"
+               "public interface Name1\n"
+               "{\n"
+               "}\n"
+               "}\n",
+               Style);
+}
+
 } // namespace format
 } // end namespace clang