checkbox, asp.net mvc3

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ASP.NET

Javascript

MVC3

Razor

I'm beginner in the web, I will test if a checkbox is checked or not checked if it is I will post a template if not another template, which will be dynamic, If I uncheck switche to another template (I have two template)
Like this:

<input type="checkbox" name="CHECKBOX_1" value="1" id="1" checked="checked"/>;     
        if(...){
            template_2  
        }
        else(...)
        {
            template_1   
        }

how can i do this?

I am sorry for my bad english

thanks,