How to count row in List Item[K2 SmartForm]?

There is a built in method that does this. If you go to you list view and the add a datalabel at the bottom of the display area. Then put an expression via the properties on that datalabel. In the expression bulder screen there is a section for List Aggregate. In there there should be a method for listcount. You just have to drag that onto the expressio builder and then drag whcih coloumn you want to do the count on.

Hope that helps.