Script to add images to media library

I am running on a Windows 7 system with ASP.NET and .NET Framework 4.5. I am writing a VB.NET program to generate graphics files (JPEG and PNG). I need to insert these into the media library for a WordPress blog. I am brand new to WordPress and PHP. I need a script to do this. (I know how to do it through the dashboard of my blog, but I need to be able to automate it.)

I found a PHP code snippet that looks close.

<?php
  $filename = 'C:\MyFolder\MyImage.jpg';
  $wp_filetype = wp_check_filetype(basename($filename), null );
  $wp_upload_dir = wp_upload_dir();
  $attachment = array(
     'guid' => $wp_upload_dir['url'] . '/' . basename( $filename ),
     'post_mime_type' => $wp_filetype['type'],
     'post_title' => preg_replace( '/\.[^.]+$/', '', basename( $filename ) ),
     'post_content' => '',
     'post_status' => 'inherit'
  );
  $attach_id = wp_insert_attachment( $attachment, $filename, 0 );
  // you must first include the image.php file
  // for the function wp_generate_attachment_metadata() to work
  require_once( ABSPATH . 'wp-admin/includes/image.php' );
  $attach_data = wp_generate_attachment_metadata( $attach_id, $filename );
  wp_update_attachment_metadata( $attach_id, $attach_data );
?>

But I don’t know how to tell it which blog to insert it into.

And I don’t know if I can use Windows syntax for specifying the file name.

Please help! Thanks!