I'm trying to download a file from the web and save it locally, but I get an exception:

C# The process cannot access the file 'blah' because it is being used by another process.

This is my code:

File.Create("data.csv");  // create the file
request = (HttpWebRequest)WebRequest.CreateDefault(new Uri(url));
request.Timeout = 30000;
response = (HttpWebResponse)request.GetResponse();

using (Stream file = File.OpenWrite("data.csv"), // <-- Exception here
    input = response.GetResponseStream())
{
    // Save the file using Jon Skeet's CopyStream method
    CopyStream(input, file);
}

I've seen numerous other questions with the same exception, but none of them seem to apply here. Any help?