Try do not to use OleDBConnection, use the respective "professional" data connection. eg. for MS Sql Server, use SqlConnection, while for Oracle, use OracleDataConnection. yes, the connection built by data explorer seems to be faster than the manual built one. but it's just because the former will be initiallezed at the very begining of the application start. for the latter, if you try more times, you will find it has the same speed with the former one; and, it's more flexible

A Positive Thinker