So far I have this code run when the X button is clicked, but I'm not sure if this is the correct way to terminate threads on a form on exit.

           Type t = this.GetType();
           foreach (PropertyInfo pi in t.GetProperties())
           {
                if (pi.GetType() == typeof(Thread))
                {
                    MethodInfo mi = pi.GetType().GetMethod("Abort");
                    mi.Invoke(null, new object[] {});
                }   
            }

I keep getting this error: "An attempt has been made to free an RCW that is in use. The RCW is in use on the active thread or another thread. Attempting to free an in-use RCW can cause corruption or data loss."