How To reset the OnDemandGrid - dojo

Question

I am using OnDemandGrid with JSONrest store in my application.For the first time,the grid is loading fine , if i search again for other data,the data already in the Grid is getting overlapped with new data.Can someone tell me how to reset or refresh the OnDemandGrid?
Here is my code,
function (request, Memory, OnDemandGrid,JsonRest) {
var jsonstore = new JsonRest({target: url,idProperty: "srno"});
grid = new OnDemandGrid({
store: jsonstore,
columns: Layout,
minRowsPerPage : 40,
maxRowsPerPage : 40,
keepScrollPosition : true,
loadingMessage: "Loading data...",
noDataMessage: "No results found."
}, "grid");
grid.startup();
});

Answer 1

Here's an Example taken from http://forums.arcgis.com/threads/39150-dojox.grid.DataGrid-how-to-clear-results
var newStore = new dojo.data.ItemFileReadStore({data: { identifier: "", items: []}});
var grid = dijit.byId("grid");
grid.setStore(newStore);
}
to clear the Results of a Grid.
We use an similar case to delete our used ItemFileReadStore:
var emptyStore = clearStore();
dijit.byId("selectGemarkung").store = emptyStore;
Hope this helps.
UPDATE 1:
Look at this : delete item from a dojo.store.jsonrest
I think jsonstore.remove() will do it.
Regards, Miriam

Answer 2

Collection data should be set to null; else refresh() wont work. Also collection data should not be assigned blank store object dojo.data.ItemFileReadStore.
grid.collection.setData("");
grid.refresh();
Since we are removing collection from OnDemandGrid internal dstore errors will be logged in console for below js files.
dstore/Trackable.js,
dstore/Memory.js,
dstore/Promised.js