Logging application responses to a network server

I have an application which creates log everytime an option is selected in it.

I need to capture these responses directly to a SQL server. Is there any C# code to do so. And also the SQL server should be able to handle complete traffic. As the repsonses will be coming from almost 1 million machines.

What should I do to handle so much of traffic on server and to establish this connection. is there any SQL configuration.

Presently this application is logging responses to a txt file on server. But many of the responses are getting missed.

Thanks in advance.