Our WinForms Suite has the Splash Screen Manager component that can be used to indicate that the application is busy. A regular approach that is commonly used is enabling the Application.UserWaitCursor option. The Splash Screen Manager allows you to show custom loading panels with your own design instead.
To learn more about the capabilities provided by the component used in this example, refer to the Wait Form document in our online documentation.
Another way to point out to an en-user that the application is in a busy state is to use our Overlay Form. This is a semi-transparent splash screen that overlaps a control or an entire form and prevents users from interacting with this control. Please review the mentioned documentation topic for additional information. You can also tun the Overlay Form module in the XtraEditors MainDemo to see the form in action.