c# - Refresing data in DataGrid is too "Flashy" -

i have method in dispatchertimer refreshes datagrid's data every 3 seconds. (3 seconds testing purposes)

the thing every time datagrid gets refreshed, clears data , loads data again database(obviously). issue creates "flashy" effect each time data loads, because of rows being cleared , re-loaded datagrid.

so question is, (after have taken @ code below) there better way of loading data again , again without creating flashing effect in datagrid?

my method call data wcf service:

public async task loadtrucks() {     using (truckserviceclient service = new truckserviceclient())     {         list<clientitems> truckitems = new list<clientitems>();         if (dgviewprojects.items.count <= 0)         {             foreach (var item in await service.gettrucksasync())             {                 truckitems.add(new clientitems                 {                     truckquoteid = item.quoteid,                     truckchassismanufacturer = item.chassismanufacturer,                     truckchassismodel = item.chassismodel,                     truckstatus = item.status,                     truckjobnumber = item.jobnumbers,                     truckaddedby = item.addedby,                     truckclient = item.clientname                 });             }         }         dgviewprojects.itemssource = (truckitems.toarray());     } } 

here call loadtrucks() method , create dispatchertimer:

private async void dgviewprojects_loaded(object sender, routedeventargs e) {     await loadtrucks();      var timer = new dispatchertimer();     timer.interval = timespan.fromseconds(3);     timer.tick += new eventhandler(async (object o, eventargs t) =>     {         dgviewprojects.itemssource = null;         await loadtrucks();     });     timer.start(); } 

check if item given key exists , update properties instead of switching out items.

(this idea in terms of performance, current logic requires complete recreation of data grid contents.)