.Net memory increase.

hello, i'm having a problem that i'm trying to solve this weekend. i have create a "get history" program based on your example in VB and it's working without a problem from Monday to Friday. On the weekend i done some tests for error checking and i notice that when it try to connect and receives a login error that "trading is closed for the weekend........" my computer memory increase like something isn't disposed. If i press again connect it increase more and more until i close the program.

Can you help me what i have to check