InfoPath Dev

Hello Every One,

I have 2 views under those views i have added same drop down list, i want to set validation for a dropdown list as not blank for secound view,

EXAMPLE : when user open a form, in first view it allows to leave dropdown list blank, when user switches to secound view it should not allow to leave drop down list blank, Kindly please help me

Validation is not per view, but on the node itself. Thus, you'll probably need another field to track whether the user has switched to the second view and custom validation to check that's field's values.