Generate param comments in C# proto plugin
diff --git a/src/csharp/Grpc.IntegrationTesting/ServicesGrpc.cs b/src/csharp/Grpc.IntegrationTesting/ServicesGrpc.cs
index 54d81e2..5135d9a 100644
--- a/src/csharp/Grpc.IntegrationTesting/ServicesGrpc.cs
+++ b/src/csharp/Grpc.IntegrationTesting/ServicesGrpc.cs
@@ -74,6 +74,9 @@
       /// One request followed by one response.
       /// The server returns the client payload as-is.
       /// </summary>
+      /// <param name="request">The request received from the client.</param>
+      /// <param name="context">The context of the server-side call handler being invoked.</param>
+      /// <returns>The response to send back to the client (wrapped by a task).</returns>
       public virtual global::System.Threading.Tasks.Task<global::Grpc.Testing.SimpleResponse> UnaryCall(global::Grpc.Testing.SimpleRequest request, ServerCallContext context)
       {
         throw new RpcException(new Status(StatusCode.Unimplemented, ""));
@@ -83,6 +86,10 @@
       /// One request followed by one response.
       /// The server returns the client payload as-is.
       /// </summary>
+      /// <param name="requestStream">Used for reading requests from the client.</param>
+      /// <param name="responseStream">Used for sending responses back to the client.</param>
+      /// <param name="context">The context of the server-side call handler being invoked.</param>
+      /// <returns>A task indicating completion of the handler.</returns>
       public virtual global::System.Threading.Tasks.Task StreamingCall(IAsyncStreamReader<global::Grpc.Testing.SimpleRequest> requestStream, IServerStreamWriter<global::Grpc.Testing.SimpleResponse> responseStream, ServerCallContext context)
       {
         throw new RpcException(new Status(StatusCode.Unimplemented, ""));
@@ -117,6 +124,11 @@
       /// One request followed by one response.
       /// The server returns the client payload as-is.
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The response received from the server.</returns>
       public virtual global::Grpc.Testing.SimpleResponse UnaryCall(global::Grpc.Testing.SimpleRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
         return UnaryCall(request, new CallOptions(headers, deadline, cancellationToken));
@@ -125,6 +137,9 @@
       /// One request followed by one response.
       /// The server returns the client payload as-is.
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The response received from the server.</returns>
       public virtual global::Grpc.Testing.SimpleResponse UnaryCall(global::Grpc.Testing.SimpleRequest request, CallOptions options)
       {
         return CallInvoker.BlockingUnaryCall(__Method_UnaryCall, null, options, request);
@@ -133,6 +148,11 @@
       /// One request followed by one response.
       /// The server returns the client payload as-is.
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncUnaryCall<global::Grpc.Testing.SimpleResponse> UnaryCallAsync(global::Grpc.Testing.SimpleRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
         return UnaryCallAsync(request, new CallOptions(headers, deadline, cancellationToken));
@@ -141,6 +161,9 @@
       /// One request followed by one response.
       /// The server returns the client payload as-is.
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncUnaryCall<global::Grpc.Testing.SimpleResponse> UnaryCallAsync(global::Grpc.Testing.SimpleRequest request, CallOptions options)
       {
         return CallInvoker.AsyncUnaryCall(__Method_UnaryCall, null, options, request);
@@ -149,6 +172,10 @@
       /// One request followed by one response.
       /// The server returns the client payload as-is.
       /// </summary>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncDuplexStreamingCall<global::Grpc.Testing.SimpleRequest, global::Grpc.Testing.SimpleResponse> StreamingCall(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
         return StreamingCall(new CallOptions(headers, deadline, cancellationToken));
@@ -157,6 +184,8 @@
       /// One request followed by one response.
       /// The server returns the client payload as-is.
       /// </summary>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncDuplexStreamingCall<global::Grpc.Testing.SimpleRequest, global::Grpc.Testing.SimpleResponse> StreamingCall(CallOptions options)
       {
         return CallInvoker.AsyncDuplexStreamingCall(__Method_StreamingCall, null, options);
@@ -169,6 +198,7 @@
     }
 
     /// <summary>Creates service definition that can be registered with a server</summary>
+    /// <param name="serviceImpl">An object implementing the server-side handling logic.</param>
     public static ServerServiceDefinition BindService(BenchmarkServiceBase serviceImpl)
     {
       return ServerServiceDefinition.CreateBuilder()
@@ -234,6 +264,10 @@
       /// and once the shutdown has finished, the OK status is sent to terminate
       /// this RPC.
       /// </summary>
+      /// <param name="requestStream">Used for reading requests from the client.</param>
+      /// <param name="responseStream">Used for sending responses back to the client.</param>
+      /// <param name="context">The context of the server-side call handler being invoked.</param>
+      /// <returns>A task indicating completion of the handler.</returns>
       public virtual global::System.Threading.Tasks.Task RunServer(IAsyncStreamReader<global::Grpc.Testing.ServerArgs> requestStream, IServerStreamWriter<global::Grpc.Testing.ServerStatus> responseStream, ServerCallContext context)
       {
         throw new RpcException(new Status(StatusCode.Unimplemented, ""));
@@ -247,6 +281,10 @@
       /// and once the shutdown has finished, the OK status is sent to terminate
       /// this RPC.
       /// </summary>
+      /// <param name="requestStream">Used for reading requests from the client.</param>
+      /// <param name="responseStream">Used for sending responses back to the client.</param>
+      /// <param name="context">The context of the server-side call handler being invoked.</param>
+      /// <returns>A task indicating completion of the handler.</returns>
       public virtual global::System.Threading.Tasks.Task RunClient(IAsyncStreamReader<global::Grpc.Testing.ClientArgs> requestStream, IServerStreamWriter<global::Grpc.Testing.ClientStatus> responseStream, ServerCallContext context)
       {
         throw new RpcException(new Status(StatusCode.Unimplemented, ""));
@@ -255,6 +293,9 @@
       /// <summary>
       /// Just return the core count - unary call
       /// </summary>
+      /// <param name="request">The request received from the client.</param>
+      /// <param name="context">The context of the server-side call handler being invoked.</param>
+      /// <returns>The response to send back to the client (wrapped by a task).</returns>
       public virtual global::System.Threading.Tasks.Task<global::Grpc.Testing.CoreResponse> CoreCount(global::Grpc.Testing.CoreRequest request, ServerCallContext context)
       {
         throw new RpcException(new Status(StatusCode.Unimplemented, ""));
@@ -263,6 +304,9 @@
       /// <summary>
       /// Quit this worker
       /// </summary>
+      /// <param name="request">The request received from the client.</param>
+      /// <param name="context">The context of the server-side call handler being invoked.</param>
+      /// <returns>The response to send back to the client (wrapped by a task).</returns>
       public virtual global::System.Threading.Tasks.Task<global::Grpc.Testing.Void> QuitWorker(global::Grpc.Testing.Void request, ServerCallContext context)
       {
         throw new RpcException(new Status(StatusCode.Unimplemented, ""));
@@ -301,6 +345,10 @@
       /// and once the shutdown has finished, the OK status is sent to terminate
       /// this RPC.
       /// </summary>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncDuplexStreamingCall<global::Grpc.Testing.ServerArgs, global::Grpc.Testing.ServerStatus> RunServer(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
         return RunServer(new CallOptions(headers, deadline, cancellationToken));
@@ -313,6 +361,8 @@
       /// and once the shutdown has finished, the OK status is sent to terminate
       /// this RPC.
       /// </summary>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncDuplexStreamingCall<global::Grpc.Testing.ServerArgs, global::Grpc.Testing.ServerStatus> RunServer(CallOptions options)
       {
         return CallInvoker.AsyncDuplexStreamingCall(__Method_RunServer, null, options);
@@ -325,6 +375,10 @@
       /// and once the shutdown has finished, the OK status is sent to terminate
       /// this RPC.
       /// </summary>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncDuplexStreamingCall<global::Grpc.Testing.ClientArgs, global::Grpc.Testing.ClientStatus> RunClient(Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
         return RunClient(new CallOptions(headers, deadline, cancellationToken));
@@ -337,6 +391,8 @@
       /// and once the shutdown has finished, the OK status is sent to terminate
       /// this RPC.
       /// </summary>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncDuplexStreamingCall<global::Grpc.Testing.ClientArgs, global::Grpc.Testing.ClientStatus> RunClient(CallOptions options)
       {
         return CallInvoker.AsyncDuplexStreamingCall(__Method_RunClient, null, options);
@@ -344,6 +400,11 @@
       /// <summary>
       /// Just return the core count - unary call
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The response received from the server.</returns>
       public virtual global::Grpc.Testing.CoreResponse CoreCount(global::Grpc.Testing.CoreRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
         return CoreCount(request, new CallOptions(headers, deadline, cancellationToken));
@@ -351,6 +412,9 @@
       /// <summary>
       /// Just return the core count - unary call
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The response received from the server.</returns>
       public virtual global::Grpc.Testing.CoreResponse CoreCount(global::Grpc.Testing.CoreRequest request, CallOptions options)
       {
         return CallInvoker.BlockingUnaryCall(__Method_CoreCount, null, options, request);
@@ -358,6 +422,11 @@
       /// <summary>
       /// Just return the core count - unary call
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncUnaryCall<global::Grpc.Testing.CoreResponse> CoreCountAsync(global::Grpc.Testing.CoreRequest request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
         return CoreCountAsync(request, new CallOptions(headers, deadline, cancellationToken));
@@ -365,6 +434,9 @@
       /// <summary>
       /// Just return the core count - unary call
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncUnaryCall<global::Grpc.Testing.CoreResponse> CoreCountAsync(global::Grpc.Testing.CoreRequest request, CallOptions options)
       {
         return CallInvoker.AsyncUnaryCall(__Method_CoreCount, null, options, request);
@@ -372,6 +444,11 @@
       /// <summary>
       /// Quit this worker
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The response received from the server.</returns>
       public virtual global::Grpc.Testing.Void QuitWorker(global::Grpc.Testing.Void request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
         return QuitWorker(request, new CallOptions(headers, deadline, cancellationToken));
@@ -379,6 +456,9 @@
       /// <summary>
       /// Quit this worker
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The response received from the server.</returns>
       public virtual global::Grpc.Testing.Void QuitWorker(global::Grpc.Testing.Void request, CallOptions options)
       {
         return CallInvoker.BlockingUnaryCall(__Method_QuitWorker, null, options, request);
@@ -386,6 +466,11 @@
       /// <summary>
       /// Quit this worker
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="headers">The initial metadata to send with the call. This parameter is optional.</param>
+      /// <param name="deadline">An optional deadline for the call. The call will be cancelled if deadline is hit.</param>
+      /// <param name="cancellationToken">An optional token for canceling the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncUnaryCall<global::Grpc.Testing.Void> QuitWorkerAsync(global::Grpc.Testing.Void request, Metadata headers = null, DateTime? deadline = null, CancellationToken cancellationToken = default(CancellationToken))
       {
         return QuitWorkerAsync(request, new CallOptions(headers, deadline, cancellationToken));
@@ -393,6 +478,9 @@
       /// <summary>
       /// Quit this worker
       /// </summary>
+      /// <param name="request">The request to send to the server.</param>
+      /// <param name="options">The options for the call.</param>
+      /// <returns>The call object.</returns>
       public virtual AsyncUnaryCall<global::Grpc.Testing.Void> QuitWorkerAsync(global::Grpc.Testing.Void request, CallOptions options)
       {
         return CallInvoker.AsyncUnaryCall(__Method_QuitWorker, null, options, request);
@@ -405,6 +493,7 @@
     }
 
     /// <summary>Creates service definition that can be registered with a server</summary>
+    /// <param name="serviceImpl">An object implementing the server-side handling logic.</param>
     public static ServerServiceDefinition BindService(WorkerServiceBase serviceImpl)
     {
       return ServerServiceDefinition.CreateBuilder()