Show file as web page, not an automatic download | MVC Asp.net filter

InlineFileAttribute.cs

public class InlineFileAttribute : ActionFilterAttribute
{
    private const string ContentDisposition = "Content-Disposition";

    public override void OnResultExecuted(ResultExecutedContext filterContext)
    {
        var headers = filterContext.HttpContext.Response.Headers;
        if (!string.IsNullOrWhiteSpace(headers[ContentDisposition]))
            headers[ContentDisposition] = headers[ContentDisposition].Replace("attachment", "inline");
        base.OnResultExecuted(filterContext);
    }
}