ASP.Net: The Timeout period elapsed prior to obtaining a connection from the pool.

Hi Friends, I have one asmx web service in which it has 3 modules

ApplicationManager.vb, AgencyManager.vb and InventoryManager.vb.

ApplicationManager.vb calls the method GetAgency in AgencyManager.vb which inturn calls the functions in InventoryManager.vb

My InventoryService.asmx calls the method GetAllAgencies() in ApplicationManager.vb

so I have a sql db connection in almost every page, and in InventoryManager.vb I have 50 functions which retrives the data from db so in every function I am opening and closing the connections, this cause me some problem.

The error is shown below.

"The Timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached."

It means that all Connections are finished so I have changed the Max Pool Size to 1000 in my web.config file. but this is not a good practice,

How can I solve this that mean how can I use the single db connection for all the application?

Thanks in Advance

Ganesh