Look at the ICustomPropertyManager interface in the API documentation.
Correct. The Evaluated Value is generated when the text or expression is evaluated.
Thanks Michael and Solid Air,
Actually i have created custom window form using c#.net to input values for customer property and update all parts and assembly on one go.
I have customer property called 'Manufacture' for one of my solidworks file and it contains many parts and assemblies to it. they all have custom property called 'Manufacture'.
I want to create form as i have already added custom add-ins so that when user provide value to my custom form it will update all parts and files in one go rather then going one by one.
Hope above requirement is clear and i need your help to implement.