how to call form load?

You don't call an event. Events are raised. The form's Load event can only be raised by the form. The form will raise its Load event when it is shown for the first time.

If you have a Load event handler, i.e. a method that is registered to handle the Load event, then that will be automatically invoked when the event is raised. You can call it explicitly as well if you want to, but you shouldn't. Event handlers should be used exclusively to handle events to avoid potential issues.

Now, if you have code in the Load event handler that you want to execute other times as well, the answer is to take that code out of the Load event handler. Create a new method and put the code there. You can then call that method from the Load event handler and from anywhere else you like as well.
 
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