public static TimeSpan Insert(List <Temporary_LoadTestForTransactionBulkInsert> trx)
{
var timer = new Stopwatch();
using var context = new YourContext();
var config = new BulkConfig()
{
BatchSize = 2000,
TrackingEntities = false,
SetOutputIdentity = true,
};
timer.Start();
context.BulkInsertAsync(trx, config).Wait();
timer.Stop();
return(timer.Elapsed);
}