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Programming Interactive Brokers ActiveX API using Visual C# and Windows Forms – Debugging Tips

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Goals of the Tutorial

The purpose of this tutorial is to demonstrate some basic techniques for debugging Visual C# programs that use the Interactive Brokers (IB) ActiveX Application Programming Interface (API). Concepts learned in this tutorial can be applied to larger projects such as building quote screens, capturing live market data and developing automated trading systems.

Tutorial Pre-Requisites

Prior to working on the debugging tips shown below, you should complete one or more tutorials on building Visual C# applications with the IB TWS API. some examples are:

  1. IB ActiveX API using C#/Winforms – Realtime Data
  2. IB ActiveX API using C#/Winforms – Historical Data
  3. IB ActiveX API using C#/Winforms – Submitting Orders

Important Notes: Interactive Brokers routinely releases new versions of the API. In a given release, some of the method calls and parameters to those calls may change. Any changes will be reflected in their on-line documentation. Interactive Brokers typically shuts down their system every Saturday to do maintenance. If you are trying log in over a weekend and cannot, it is probably because their systems are down for maintenance.

In the next section some tips for debugging TWS API applications will be presented.


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