How to display the data when we click on button in mvc 4??

You can get the value from the select (Dropdown) elements separately from the groups and user dropdown, and then get the value (data). You can do so by using the name of the select element, and calling the Request object to retrieve the values, 

 

var group = Request["group-select"]; 
var user = Request["user-select"]; 

 

In above case the group-select and user-select would be names for the select element. Perhaps, you missed to tell us how you were going to get the value, or what the data is.