Compilation in ASP.NET 1.x:

Although this model has advantages, it also has two primary disadvantages. First, the ASPX pages must be deployed to the Web site in human readable form. If your developers used the code-inline model, that means that some or all of your business logic may also be deployed on a production server. Although IIS and ASP.NET are configured not to expose the raw ASPX pages, a clever attacker could still access the files through any exploit that opened up access to the Web server. Second, the first time anyone requests a Web page, the response will be slower than normal, as the ASP.NET runtime has to compile the ASPX page.