C# 5.0 async, await

public class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    public async Task SaveFile()
    {
        await Task.Run(()=>
            using(FileStream fs = new FileStream("trashfile.bin",
                                                 FileMode.CreateNew))
            {
                BinaryWriter bw = new BinaryWriter(fs);
                for(int i = 0; i < 100000000; i++)
                    bw.Write(i);
            }
        });
    }
    public async void btnOK_Click(object sender, EventArgs e)
    {
        await SaveFile();
        MessageBox.Show("Complete.");
    }
}

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