○数字の型変換------------------------------------

１０進←１６進

Dim a As Double = Val("&H" + "F")
Debug.WriteLine(a)
結果 : 15

１６進←１０進
String = Hex(short)

８進←１０進
String = Oct(short)

○数値を文字列に変換------------------------------

Dim strPos As String = Str(10)

もしくは

Dim strPos As String = (10).ToString

○キャスト----------------------------------------

Dim l As Long = Long.Parse("10")

もしくは

Dim l As Long = CType("10", Long)