Rahul, 

I got curious  about how to get the total height of a form, so I tried it.  Here is what I did. 

In my example I am using K2 designer with Blackpearl 4.6.10

I had a project with 2 views already created. 

On one of my views:

I made data labels for each of the views. I called them top and bottom.  I used Data Type # Number.

I created another data label for the total.  Also Data Type # Number

If you have more views, you would need more data labels. 

On the total data label,  I created an expression named total.

I used the +Plus operator then under context controls I drug the top data label to one side and bottom to the other. 

I saved the view and started editing the form. 

On the form I edited the When Form initialize rule. I added Transfer Data to the end. 

For the top view I went to 'Top View name' - General - Height  and transferred that to the top data label. 

For the bottom I went to 'Bottom View name' - General  - Height and transferred that to the bottom data label. 

Then I transferred the total data label from context browser total to mapping destination total. 

I went to the runtime form and all my numbers were there. I added a line and refreshed and my numbers grew dynamically.