How to Prevent a Notification Form from Stealing Focus?

How to prevent a form from grabbing focus?

When displaying a form as a notification, focus often shifts away from the main form, which can interrupt user flow. To solve this problem, you can use the ShowWithoutActivation attribute or the CreateParams override to prevent focus grabbing.

ShowWithoutActivation

Overriding the Form.ShowWithoutActivation property prevents the form from getting focus while being displayed.

<code class="language-csharp">protected override bool ShowWithoutActivation
{
  get { return true; }
}</code>

CreateParams Override

If the notification form should also be immune to clicks, you can use the CreateParams override:

<code class="language-csharp">protected override CreateParams CreateParams
{
  get
  {
    CreateParams baseParams = base.CreateParams;

    const int WS_EX_NOACTIVATE = 0x08000000;
    const int WS_EX_TOOLWINDOW = 0x00000080;
    baseParams.ExStyle |= (int)(WS_EX_NOACTIVATE | WS_EX_TOOLWINDOW);

    return baseParams;
  }
}</code>

By using these methods, the notification form can be displayed without breaking focus of the main form.

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