How to get value from multilinetext field using csom

//The below code is used to retrieve value from multiline text field using csom

static void Main(string[] args)
{
 string siteUrl = "http://domainname/sites/TestSite";
 using(ClientContext clientContext = new ClientContext(siteUrl))
 {
    var web = clientContext.Web;
    var list = web.Lists.GetByTitle("Test List");
    var listFields = list.Fields;
    clientContext.Load(listFields);
    var listItem = list.GetItemById("1");
    var itemFieldValues = listItem.FieldValuesAsText;
    clientContext.Load(itemFieldValues);
    clientContext.ExecuteQuery();
    string multitextValue = Convert.ToString(itemFieldValues["MultiLineTextField"]);
 }
}