Async CTP and Entity Framework

gistfile1.cs

// This code is provided "as-is" without warranty of any kind, either expressed or implied.

public static class AsyncExtensions
{
    public static async Task<IEnumerable<T>> AsAsync<T>(this IQueryable<T> source)
        where T : EntityObject
    {
        var query = (ObjectQuery<T>)source;

        var cmd = new SqlCommand();

        cmd.Connection = (SqlConnection)((EntityConnection)query.Context.Connection).StoreConnection;
        cmd.CommandText = query.ToTraceString();
        cmd.Parameters.AddRange(query.Parameters.Select(x => new SqlParameter(x.Name, x.Value ?? DBNull.Value)).ToArray());

        cmd.Connection.ConnectionString = new SqlConnectionStringBuilder(cmd.Connection.ConnectionString)
        {
            AsynchronousProcessing = true
        }.ToString();

        cmd.Connection.Open();

        var reader = await Task.Factory.FromAsync<SqlDataReader>(cmd.BeginExecuteReader(), cmd.EndExecuteReader);

        return query.Context.Translate<T>(reader);
    }
}