I was a developer for about forty years, retired last year. First seven years or so I worked in MUMPS on mostly DEC VAX midframes. Then in the early 90s I learned Visual Basic to break into the Windows world, worked in that for almost a decade until .NET came out in about 2000; I learned VB.NET, programmed in that for about six or seven years. Then I taught myself C# which is what I used for the next 13 years or so. I did lots of SQL Server programming account the way, but outside of that, those were really the only languages/frameworks that I needed to have a consistent career for almost four decades.