Index: clang/lib/Format/FormatTokenLexer.h
===================================================================
--- clang/lib/Format/FormatTokenLexer.h
+++ clang/lib/Format/FormatTokenLexer.h
@@ -53,6 +53,7 @@
   bool tryMergeCSharpKeywordVariables();
   bool tryMergeCSharpNullConditionals();
   bool tryMergeCSharpDoubleQuestion();
+  bool tryTransformCSharpForEach();
 
   bool tryMergeTokens(ArrayRef<tok::TokenKind> Kinds, TokenType NewType);
 
Index: clang/lib/Format/FormatTokenLexer.cpp
===================================================================
--- clang/lib/Format/FormatTokenLexer.cpp
+++ clang/lib/Format/FormatTokenLexer.cpp
@@ -80,6 +80,8 @@
       return;
     if (tryMergeCSharpNullConditionals())
       return;
+    if (tryTransformCSharpForEach())
+      return;
     static const tok::TokenKind JSRightArrow[] = {tok::equal, tok::greater};
     if (tryMergeTokens(JSRightArrow, TT_JsFatArrow))
       return;
@@ -254,6 +256,21 @@
   return true;
 }
 
+// In C# transform identifier foreach into kw_foreach
+bool FormatTokenLexer::tryTransformCSharpForEach() {
+  if (Tokens.size() < 1)
+    return false;
+  auto &Identifier = *(Tokens.end() - 1);
+  if (!Identifier->is(tok::identifier))
+    return false;
+  if (Identifier->TokenText != "foreach")
+    return false;
+
+  Identifier->Type = TT_ForEachMacro;
+  Identifier->Tok.setKind(tok::kw_for);
+  return true;
+}
+
 bool FormatTokenLexer::tryMergeLessLess() {
   // Merge X,less,less,Y into X,lessless,Y unless X or Y is less.
   if (Tokens.size() < 3)
Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -2624,10 +2624,6 @@
     return Style.Language == FormatStyle::LK_JavaScript ||
            !Left.TokenText.endswith("=*/");
   if (Right.is(tok::l_paren)) {
-    // using (FileStream fs...
-    if (Style.isCSharp() && Left.is(tok::kw_using) &&
-        Style.SpaceBeforeParens != FormatStyle::SBPO_Never)
-      return true;
     if ((Left.is(tok::r_paren) && Left.is(TT_AttributeParen)) ||
         (Left.is(tok::r_square) && Left.is(TT_AttributeSquare)))
       return true;
@@ -2718,7 +2714,15 @@
     // and "%d %d"
     if (Left.is(tok::numeric_constant) && Right.is(tok::percent))
       return Right.WhitespaceRange.getEnd() != Right.WhitespaceRange.getBegin();
-  } else if (Style.Language == FormatStyle::LK_JavaScript || Style.isCSharp()) {
+  } else if (Style.isCSharp()) {
+    // space between type and variable e.g. Dictionary<string,string> foo;
+    if (Left.is(TT_TemplateCloser) && Right.is(TT_StartOfName))
+      return true;
+    // space between keywords and paren e.g. "using ("
+    if (Right.is(tok::l_paren))
+      if (Left.is(tok::kw_using))
+        return spaceRequiredBeforeParens(Left);
+  } else if (Style.Language == FormatStyle::LK_JavaScript) {
     if (Left.is(TT_JsFatArrow))
       return true;
     // for await ( ...
Index: clang/unittests/Format/FormatTestCSharp.cpp
===================================================================
--- clang/unittests/Format/FormatTestCSharp.cpp
+++ clang/unittests/Format/FormatTestCSharp.cpp
@@ -58,6 +58,7 @@
                "    while (true) f();\n"
                "    for (;;) f();\n"
                "    if (true) f();\n"
+               "    foreach (x in y) f();\n"
                "  }\n"
                "}");
 }
@@ -119,13 +120,25 @@
 }
 
 TEST_F(FormatTestCSharp, CSharpNullConditional) {
+  FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);
+  Style.SpaceBeforeParens = FormatStyle::SBPO_Always;
+
   verifyFormat(
       "public Person(string firstName, string lastName, int? age=null)");
 
-  verifyFormat("switch(args?.Length)");
+  verifyFormat("foo () {\n"
+               "  switch (args?.Length) {}\n"
+               "}",
+               Style);
+
+  verifyFormat("switch (args?.Length) {}", Style);
 
   verifyFormat("public static void Main(string[] args) { string dirPath "
                "= args?[0]; }");
+
+  Style.SpaceBeforeParens = FormatStyle::SBPO_Never;
+
+  verifyFormat("switch(args?.Length) {}", Style);
 }
 
 TEST_F(FormatTestCSharp, Attributes) {
@@ -168,16 +181,22 @@
 TEST_F(FormatTestCSharp, CSharpUsing) {
   FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);
   Style.SpaceBeforeParens = FormatStyle::SBPO_Always;
-  verifyFormat("public void foo() {\n"
+  verifyFormat("public void foo () {\n"
                "  using (StreamWriter sw = new StreamWriter (filenameA)) {}\n"
                "}",
                Style);
 
+  verifyFormat("using (StreamWriter sw = new StreamWriter (filenameB)) {}",
+               Style);
+
   Style.SpaceBeforeParens = FormatStyle::SBPO_Never;
   verifyFormat("public void foo() {\n"
                "  using(StreamWriter sw = new StreamWriter(filenameB)) {}\n"
                "}",
                Style);
+
+  verifyFormat("using(StreamWriter sw = new StreamWriter(filenameB)) {}",
+               Style);
 }
 
 TEST_F(FormatTestCSharp, CSharpRegions) {
@@ -195,5 +214,40 @@
   verifyFormat("return _name ?? \"DEF\";");
 }
 
+TEST_F(FormatTestCSharp, CSharpSpaceBefore) {
+  FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);
+  Style.SpaceBeforeParens = FormatStyle::SBPO_Always;
+
+  verifyFormat("List<string> list;", Style);
+  verifyFormat("Dictionary<string, string> dict;", Style);
+
+  verifyFormat("for (int i = 0; i < size (); i++) {\n"
+               "}",
+               Style);
+  verifyFormat("foreach (var x in y) {\n"
+               "}",
+               Style);
+  verifyFormat("switch (x) {}", Style);
+  verifyFormat("do {\n"
+               "} while (x);",
+               Style);
+
+  Style.SpaceBeforeParens = FormatStyle::SBPO_Never;
+
+  verifyFormat("List<string> list;", Style);
+  verifyFormat("Dictionary<string, string> dict;", Style);
+
+  verifyFormat("for(int i = 0; i < size(); i++) {\n"
+               "}",
+               Style);
+  verifyFormat("foreach(var x in y) {\n"
+               "}",
+               Style);
+  verifyFormat("switch(x) {}", Style);
+  verifyFormat("do {\n"
+               "} while(x);",
+               Style);
+}
+
 } // namespace format
 } // end namespace clang