In the beginning Microsoft created its own Java compiler and called it J++. Then there was a lawsuit by Sun that went on for a while.
Microsoft decided to cancel J++ and instead, shortly afterwards C# 1.0 was released and the language was extremly similar.
I was using early C# 1.0 Betas and it was even more obvious.
Later editions and certainly C# 2.0 which introduced generics took a different path than Java and today they are different.
J++ was an actual JVM implementation, c# ran on the .net runtime that was being developed at the same time for the next generation of Visual Basic. While the languages looked superficially similar, the runtime and base class library is significantly different.
After the sun lawsuit, Microsoft dropped j++ and released j#, which allowed for a weird hybrid of Java but with the .net class library running on the .net runtime. This was short lived because why use this over c#, and has been mostly forgotten to history.
Visual Studio early on and Visual Studio today are very similar to the Borland dev studio when Hejlsberg was working there. I've used both languages/IDEs in my career extensively, albeit I haven't used Delphi in probably 15-20 years.