Neo4j - unable to connect with sample .NET hello world program

I just downloaded the neo4j Desktop and was able to create a new graph instance and connect.

• Here is the connection message You are connected as user  neo4j to  bolt://localhost:7687 Connection credentials are stored in your web browser.

Connection message

I'm a .NET developer and tried to download the sample Hello Word from https://neo4j.com/docs/developer-manual/3.2/drivers/get-started/.

However, below exceptions were thrown. Please help.

Neo4j.Driver.V1.ServiceUnavailableException
  HResult=0x80131500
  Message=Failed after retried for 5 times in 30000ms. Make sure that your database is online and retry again.
  Source=Neo4j.Driver
  StackTrace:
   at Neo4j.Driver.Internal.ExponentialBackoffRetryLogic.Retry[T](Func`1 runTxFunc)
   at Neo4j.Driver.Internal.Session.<>c__DisplayClass41_0`1.<RunTransaction>b__0()
   at Neo4j.Driver.Internal.Logging.DriverLoggerUtil.TryExecute[T](IDriverLogger logger, Func`1 func, String message)
   at Neo4j.Driver.Internal.Session.RunTransaction[T](AccessMode mode, Func`2 work, TransactionConfig txConfig)
   at Neo4j.Driver.Internal.Session.WriteTransaction[T](Func`2 work, TransactionConfig txConfig)
   at Neo4j.Driver.Internal.Session.WriteTransaction[T](Func`2 work)
   at HelloWorldExample.PrintGreeting(String message) in D:\AI\neo4j\TestNeo4j\ConsoleApp1\Program.cs:line 21
   at HelloWorldExample.Main() in D:\AI\neo4j\TestNeo4j\ConsoleApp1\Program.cs:line 42

Inner Exception 1:
AggregateException: One or more errors occurred.

Inner Exception 2:
ServiceUnavailableException: Connection with the server breaks due to SecurityException: Failed to establish encrypted connection with server bolt://localhost:7687/.

Inner Exception 3:
SecurityException: Failed to establish encrypted connection with server bolt://localhost:7687/.

Inner Exception 4: