Question

can I use it like this in View?

<%= Html.CheckBoxFor(user => user.Role, "Administrator")%>

and then just read a value of property in model if checkbox is checked:

string role = user.Role;
(role = "Administrator")

Answer 1

In your model…

public class UserEditModel { 
  public string UserName { get; set; }
  public string[] Role { get; set; }
}

In your view…

<%: Html.TextBoxFor(x = x.UserName)<br />
<input type="checkbox" name="role" id="role_Administrator" value="Administrator" />
<input type="checkbox" name="role" id="role_Create_Project" value="Create Project" />
<!-- etc -->

Yes, you need to write raw HTML for this scenario. This will bind correctly with the MVC defaults. The default CheckBoxFox really only works well with True/False bindings. Something like

<%: Html.CheckBoxFor(x => x.AcceptLicenseTerms) %>

or

<%: Html.CheckBoxFor(x => x.RememberMe) %>