Result result1 = null;
Result result2 = null;

var task1 = Task.Factory.StartNew(()=>
{
   var records = DB.Read("..");
   //Do A lot
   result1 = Process(records);
});

var task2 = Task.Factory.StartNew(()=>
{
   var records = DB.Read(".....");
   //Do A lot
   result2 = Process(records);
});

Task.WaitAll(task1, task2);

var result = Combine(result1, result2);

Result result1 = null;
Result result2 = null;

var task1 = await Task.Factory.StartNew( async ()=>
{
   var records = await DB.ReadAsync("..");
   //Do A lot
   result1 = Process(records);
});

var task2 = await Task.Factory.StartNew(async ()=>
{
   var records = await DB.ReadAsync(".....");
   //Do A lot
   result2 = Process(records);
});

Task.WaitAll(task1, task2);

var result = Combine(result1, result2);