Custom Webform In Dynamics CRM

Is have created webfrom using C# to import excel file into Dynamics CRM. Now i want to call this page from custom button in CRM.I have been searching on the internet about the way to call webform from Custom Button In CRM, but i couldn't find yet. 

The question is "Is that possible to call C# webform from custom button in CRM ?" For the custom button i used ribbon workbench.