Dashing.SessionState.GetConnectionAsync C# (CSharp) Method

        public async Task<IDbConnection> GetConnectionAsync() {
            if (this.isDisposed) {
                throw new ObjectDisposedException("Session");
            }

            if (this.connection.State == ConnectionState.Closed || this.connection.State == ConnectionState.Connecting) {
                using (await this.asyncConnectionOpenLock.LockAsync()) {
                    if (this.connection.State == ConnectionState.Closed) {
                        await ((DbConnection)this.connection).OpenAsync();
                    }
                }
            }

            if (this.connection.State != ConnectionState.Open) {
                throw new Exception("Connection in unknown state");
            }

            return this.connection;
        }