using.cs

using (var file = new System.IO.StreamReader(script)) {
  var fileContent = file.ReadToEnd();
  if (scriptType == ScriptType.Stylesheet) {
    var fromUri = new Uri(context.Server.MapPath("~/"));
    var toUri = new Uri(new FileInfo(script).DirectoryName);
    var relativeUri = fromUri.MakeRelativeUri(toUri);
    fileContent = fileContent.Replace("url(", "url(/" + relativeUri.ToString() + "/");
  }
  scriptbody.Append(fileContent);
}

This code is from line 49 in https://github.com/davecowart/RazorScriptManager/blob/master/content/Handlers/RazorScriptManager.cs . This will effectively wrap the entire statement in a try/finally block, and call .Dispose() on file in the finally. Only works with objects that implement IDisposable.

More info on using: http://msdn.microsoft.com/en-us/library/yh598w02(v=VS.100).aspx