Just give the same name to the checkbox like for all you should use below.
<input type="checkbox" id="chkid1" name="chkName" value="1" />
<input type="checkbox" id="chkid2" name="chkName" value="2" />
<input type="checkbox" id="chkid3" name="chkName" value="3" />
Now when you are submitting the page, just use the FormCollection and use the key "chkName".
Like below
public ActionResult PostThisPafe(FormCollection form)
{
string result = form["chkName"];
return View();
}
In that result you will get those values in a comma seperated way.
Cheers buddy.....