ExecuteScalarAsync
Overload List:
This method returns a Task-based asynchronous version of OracleCommand.ExecuteScalar(), which returns the first column of the first row in the result set returned by the query.
                  
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                        This method returns a Task-based asynchronous version of OracleCommand.ExecuteScalar(), which returns the first column of the first row in the result set returned by the query.
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                        ExecuteScalarAsync(CancellationToken cancellationToken) This method returns a Task-based asynchronous version of OracleCommand.ExecuteScalar()with inputCancellationToken, which returns the first column of the first row in the result set returned by the query.