jQuery Grid Plugin - jqGrid

Problems:

   Asynchronous loading,For example my json processing:[

string json = JsonConvert.SerializeObject(lstarea, Formatting.Indented);

json = "{"page":" + page + ","total":" + total + ","records":" + records+ ","data":" + json + "}"; 

 Response.Write(json);    

my jsonReader:[

jsonReader:

{

page: "page",

total: "total",

records: "records",

root: "data",

repeatitems: false,

id:"AreaID"

},]   So far everything is okay,but  now,I want to passed my records  to the background,I saw A parameter:prmNames{} ,in this,There is an argument :prmNames: { page: "page", rows: "rows", totalrows: "totalrows" },  see totalrows!Question here, in the background,I do these:

int page = Convert.ToInt32(Request.QueryString["page"]);

int rows = Convert.ToInt32(Request.QueryString["rows"]);

int totalrows = Convert.ToInt32(Request.QueryString["totalrows"]);   But  totalrows is 0,I check src ,then I know it's why: if (ts.p.rowTotal !== null && pN.totalrows !== null) { prm[pN.totalrows] = ts.p.rowTotal;  }  Because ts.p.rowTotal is null so totalrows Is't assigned, It's why? records  in jsonreader is equa totalrows in  prmNames  ? 

Functional requirements: Drag sort rows of data!