You need to provide more detail about what you are trying to accomplish.
For example, would you always want some form to be open and then simply open a new form at those two specific times? If this is the question, then you're simply asking how to manage a timer to create and display your forms:
Timer Class (System.Timers) | Microsoft Docs[
^]
Or, would you prefer only one form, which is mostly hidden, except when it pops up at those couple of times? If this is the question, then you're probably looking for a
NotifyIcon application combined with a timer. See:
Doing a NotifyIcon program the right way[
^]
Or, would you prefer that your application isn't even running most of the time? If this is your question, then your probably asking about Windows task scheduler:
Task Scheduler | Microsoft Docs[
^]
If you update your question to provide more detail, you are more likely to get a specific answer to it. As it currently stands, all anyone can do is provide some generalized advice.
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