What event takes place after a form is loaded and displayed?

[emaduddeen]

Hi Everyone,

Can you tell me what event takes place after a form is loaded and displayed including all controls on that form?

I wish to place some code in there at that time.

Thanks.

Truly,
Emad

 

[JohnH]

Form.Shown Event (System.Windows.Forms)

 

[kulrom]

I am not even sure that i understand your question but if i guess i would say that you need Form.Activated Event (System.Windows.Forms)

 

[kulrom]

Activated occurs first i guess. Isn't it John?

 

[emaduddeen]

Hi Everyone,

Thanks for the helpful replies.

I am using Form.Shown

Truly,
Emad

 

[JohnH]

I am not even sure that i understand your question but if i guess i would say that you need Form.Activated Event (System.Windows.Forms)

Don't think it's relevant which of these events come first, as they have different purpose. Shown is first time form is shown only (after Load), Activated is every time form is activated.

 

[kulrom]

I am afraid it's irrelevant in this situation unless he Activates the form himself in code.
Actually i was aware of the Shown event as well but, according his explanation it seemed that both can apply.
So yes you can use Activated here too.

 

[jmcilhinney]

I am afraid it's irrelevant in this situation unless he Activates the form himself in code.
Actually i was aware of the Shown event as well but, according his explanation it seemed that both can apply.
So yes you can use Activated here too.

Shown will be raised once only, while Activated can be raised multiple times. The original questions strongly implies that Shown is the only suitable option.

 

[kulrom]

Shown will be raised once only, while Activated can be raised multiple times. The original questions strongly implies that Shown is the only suitable option.

Would you mind if i ask you to create a new form and add Console.WriteLine("Activated raised") within the Activated event. Then run the project and see how many times it raises. Thanks

 

[JohnH]

Would you mind if i ask you to create a new form and add Console.WriteLine("Activated raised") within the Activated event. Then run the project and see how many times it raises. Thanks

You can activate a form/window many times as you switch between multiple active forms/applications, but it is only Load/Shown once.

 

[kulrom]

As i said it can be certainly activated in code or by the user. However IN THIS SCENARIO it will work perfectly fine as Shown.
If you disagree yet it's ok i can live with that

 

[jmcilhinney]

Would you mind if i ask you to create a new form and add Console.WriteLine("Activated raised") within the Activated event. Then run the project and see how many times it raises. Thanks

You can ask but I'm not going to do it because I already know. Activated will be raised as many times as the form is activated, which is every time the form gains focus, which might be many, many times in the life of the form.

Use the right tool for the job. In .NET 1.x there was only Load and Activated, so if you wanted to execute some code immediately after the form was displayed the first time and ONLY the first time, you had to handle Activated and use a Boolean flag to stop the code being executed on any but the first Activated event. That's the very reason they added the Shown event in .NET 2.0: so that you have an event that is raised only once, immediately after the form is displayed for the first time.