Linqpad script

gistfile1.cs

void Main()
{
    DoShiz();
}

public async void DoShiz()
{
    var worker = new Worker();
    var ex = await ThrowsExceptionAsync<ArgumentException>(async () => await worker.GetMessage("   "));
    var ex2 = await ThrowsExceptionAsync<ArgumentException>(() => worker.GetMessage("   "));
    
    ex.Dump();
    ex2.Dump();
}

public class Worker
{
    public async Task GetMessage(string message)
    {
        throw new ArgumentException();
    }
}

public static async Task<TException> ThrowsExceptionAsync<TException>(Func<Task> func) 
    where TException : Exception 
{  
    try  
    {  
        await func().ConfigureAwait(false); 
    } catch (TException e) 
    {  
        return e; 
    }
    throw new Exception("Delegate did not throw " + typeof(TException).Name); 
}