How can I send a big HTML block in JSON

I need to send a big block of HTML in a Json object like this:

                JsonResult jsn =  Json(new Dictionary<string, object> { { "success", true }, 
            { "lastPID", posts[0].ID }, 
            { "content", "" } });
            return jsn;

For some reason I get this error when I put that html block into the content variable: Server cannot set content type after HTTP headers have been sent.

This doesn't happen if I return some random non-html content.

Is there any encoding that I need to do before I can send my big block of html?

What 开发者_StackOverflow中文版about the client end? How do I get back the data.

Looks like this is your problem (and solution)

If you need to send HTML, why not just send HTML rather than JSON?