Difference between await and Task.Wait [duplicate]

Question

First way:

var tds=SearchProcess();
await tds;

public async  Task<XmlElement> SearchProcess()
{
}

Second way:

var tds= Task.Factory.StartNew(()=>SearchProcess());
Task.WaitAll(tds);

public XmlElement SearchProcess()
{
}

In above both approach any performance difference is there?

Answer 1

Task.WaitAll is blocking, while using await will make the containing method async. To wait for multiple tasks asynchronously you can use Task.WhenAll:

public async Task DoSomething()
{
    IEnumerable<Task> tds = SearchProcess();
    await Task.WhenAll(tds);
    //continue processing    
}