how to add column mapping in sqlbulkcopy in c# where column names contains White Space

using (SqlBulkCopy sc = new SqlBulkCopy(conn))
{
    sc.DestinationTableName = destination;

    sc.ColumnMappings.Add("ID","ID #");
    sc.ColumnMappings.Add("Amount","Amount in USD");

    sc.WriteToServer(datatable);
}

I am getting error that column dose not match in given columnmapping

Thanks in Advance.