SSL connection to the postgresql ASP.NET

Question

I am trying to connect to a postgresql database through SSL. In the appsetting.json file, my connection string is "DefaultConnection": "Sslmode=Require;Sslrootcert=rootCA.crt;Sslcert=postgres_client.crt;Sslkey=postgres_client.key;Server=xxx.xxx.xxx.xx;Database=my_database;Username=my_username" When I run the api, I get the error message as followed

System.ArgumentException: Keyword not supported: sslrootcert (Parameter 'keyword')
   at Npgsql.NpgsqlConnectionStringBuilder.GetProperty(String keyword)
   at Npgsql.NpgsqlConnectionStringBuilder.set_Item(String keyword, Object value)
   at System.Data.Common.DbConnectionStringBuilder.set_ConnectionString(String value)
   at Npgsql.NpgsqlConnectionStringBuilder..ctor(String connectionString)
   at Npgsql.NpgsqlConnection.GetPoolAndSettings()
   at Npgsql.NpgsqlConnection.set_ConnectionString(String value)
   at Npgsql.NpgsqlConnection..ctor(String connectionString)
   at Npgsql.EntityFrameworkCore.PostgreSQL.Storage.Internal.NpgsqlRelationalConnection.CreateDbConnection()
   at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.get_DbConnection()
   at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.CreateCommand(RelationalCommandParameterObject parameterObject, Guid commandId, DbCommandMethod commandMethod)
   at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReader(RelationalCommandParameterObject parameterObject)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.Enumerator.InitializeReader(DbContext _, Boolean result)
   at Npgsql.EntityFrameworkCore.PostgreSQL.Storage.Internal.NpgsqlExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryingEnumerable`1.Enumerator.MoveNext()
   at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
   at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query)
   at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)
   at System.Linq.Queryable.SingleOrDefault[TSource](IQueryable`1 source, Expression`1 predicate)

By the way, I am able to connect to my database in the terminal with psql "sslmode=verify-ca sslrootcert=/rootCA.crt sslcert=postgres_client.crt sslkey=postgres_client.key hostaddr=xxx.xxx.xxx.xx port=xxxx user=my_username dbname=my_database" So, is my asp.net connection string wrong, or the rootCA.crtfile is not set properly? Thanks in advance for any advice:))