I'm afraid if you want to create websites as Visual Studio, the only option is Visual Studio, there is a huge amount of support code, etc. that is created to run the asp.net site, and Microsoft has gone to a lot of work to do its as polished as possible. Trying to do this with PHP and another IDE will lead to heartache. My suggestion is to switch to Visual Studio, if possible, or to review how you are going to create your site.
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