Unhandled Exception: System.AggregateException: One or more errors occurred. ---> System.TimeoutException: Operation timed out after 00:00:30. ---> System.OperationCanceledException: The operation was canceled.
   at System.Threading.CancellationToken.ThrowOperationCanceledException()
   at MongoDB.Driver.Core.Clusters.Cluster.<WaitForDescriptionChangedAsync>d__1a.MoveNext() in c:\git\mongo-csharp-driver\src\MongoDB.Driver.Core\Core\Clusters\Cluster.cs:line 0
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MongoDB.Driver.Core.Clusters.Cluster.<SelectServerAsync>d__8.MoveNext() in c:\git\mongo-csharp-driver\src\MongoDB.Driver.Core\Core\Clusters\Cluster.cs:line 252
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MongoDB.Driver.Core.Bindings.ReadPreferenceBinding.<GetReadChannelSourceAsync>d__0.MoveNext() in c:\git\mongo-csharp-driver\src\MongoDB.Driver.Core\Core\Bindings\ReadPreferenceBinding.cs:line 51
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at MongoDB.Driver.Core.Operations.FindOperation`1.<ExecuteAsync>d__2.MoveNext() in c:\git\mongo-csharp-driver\src\MongoDB.Driver.Core\Core\Operations\FindOperation.cs:line 202
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MongoDB.Driver.OperationExecutor.<ExecuteReadOperationAsync>d__0`1.MoveNext() in c:\git\mongo-csharp-driver\src\MongoDB.Driver\OperationExecutor.cs:line 0
   --- End of inner exception stack trace ---
   at MongoDB.Driver.OperationExecutor.<ExecuteReadOperationAsync>d__0`1.MoveNext() in c:\git\mongo-csharp-driver\src\MongoDB.Driver\OperationExecutor.cs:line 43
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MongoDB.Driver.MongoCollectionImpl`1.<ExecuteReadOperation>d__47`1.MoveNext() in c:\git\mongo-csharp-driver\src\MongoDB.Driver\MongoCollectionImpl.cs:line 0
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MongoDB.Driver.IAsyncCursorSourceExtensions.<ToListAsync>d__14`1.MoveNext() in c:\git\mongo-csharp-driver\src\MongoDB.Driver.Core\IAsyncCursorSource.cs:line 63
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at mdbclient_cs.Program.<Run>d__0.MoveNext() in c:\dev\mdbclient\mdbclient-cs\Program.cs:line 31
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at mdbclient_cs.Program.Main(String[] args) in c:\dev\mdbclient\mdbclient-cs\Program.cs:line 16

            var cnnString = "mongodb://<useName>:<pwd>@dsxxx.mongolab.com:53617/db01";

            var mongoUrl = new MongoUrl(cnnString);
            var client = new MongoClient(mongoUrl);
            var database = client.GetDatabase(mongoUrl.DatabaseName);
            var collection = database.GetCollection<BsonDocument>("Users");
            var list = await collection.Find(new BsonDocument("Name", "Jack"))
                .ToListAsync();
            foreach (var document in list)
            {
                Console.WriteLine(document["Name"]);
            }