Thank you kindly for the quick answer.
Yes, while missing selection-menu-items for TS, I can do some TS this way:
first add a new file as Javascript-file, then put in some code and then rename it to TS. If i do this in a ASP.Net-project and not in a website-project, it will be displayed with the right TS-Logo as favicon (ico). But then it will be treated as a Javascript file, e.g. without extended typescript-expressions like 'function function1(user: string)' instead of 'function function1(user)' - without type setting.
So if I want to execute a project with some HTML-file as starting point that is calling a function of this TS-file, I must first manually compile the TS-file to a javascript file (console with tsc.exe ), replacing in my project the TS-file by the resulting JS-file etc. ...
Juno