How to upload local files to Offices365 SharePoint Online Site by C# Code?

Hi all,

I've some requirement needs to upload files from local to Office365 Sharepoint Online Site Document Library using C# code?

Uri uri = new Uri("siteurl");

                ClientContext context = new ClientContext(uri);

                var passWord = new SecureString();
                foreach (var c in "password") passWord.AppendChar(c);
                context.Credentials = new SharePointOnlineCredentials("email", passWord);

Web web = context.Web;

               FileCreationInformation newFile = new FileCreationInformation();

                newFile.Content = System.IO.File.ReadAllBytes(@"C:\myfile.txt");
                newFile.Url = "file uploaded via client OM.txt";
                List docs = web.Lists.GetByTitle("Documents");
                Microsoft.SharePoint.Client.File uploadFile = docs.RootFolder.Files.Add(newFile);
                context.ExecuteQuery();

}

I don't know whether this method works and I'm always get issue for getting the ClientContext.

Thanks for your reply.