Can I use a form in a dashboard widget?

There are two options to use forms in a dashboard widget:

1. Use the parameter control_callback. See the Codex

   wp_add_dashboard_widget(
       'my_id',            // $widget_id 
       'my_name',          // $widget_name 
       'my_render_widget', // $callback 
       'my_control'        // $control_callback
   );
   function my_control()
   {
       // print some form elements, WordPress will handle the <form> tag.
   }
   

2. If you want to use a form in the main display handler, set the form action to admin-post.php and add a callback function for a custom action there. Example. When you are done processing the form redirect back to the dashboard.