Help with conections parameters... (no replies)

I have a query that execute it in 158s in MySqlQuerybrowser, where I try to execute this query from VB.net to fill a data adapter and show a report with CrystalReports, VB show a error message for this exception {"Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding."}, I've modified the coneection string with "Server=myServerAddress;Database=myDataBase;Uid=myUsername;Pwd=myPassword;Connection Timeout=300;" but I have the same error

somebody knows how to work with this???