Why do you want to load a SelectList into a textarea? If you would like to return a "string list" you will need to convert your strResults variable from a List to a string in your Controller. Here is the code to do this:
string strReturnString = string.Join(",", strResult.ToArray());
ViewData ["result"] = strReturnString;
return View ("Index");
Then:
Use @ViewData["result"]
in your View