Get file extension name : FileInfo « Stream File « VB.Net Tutorial

1. VB.Net Tutorial
2. Stream File
3. FileInfo

Public Class Tester
    Public Shared Sub Main
    
        Dim fileDetail As IO.FileInfo


        fileDetail = My.Computer.FileSystem.GetFileInfo("test.txt")

        Console.WriteLine(fileDetail.Extension)
    End Sub

End Class

.txt