Convert.ToInt64 (SByte) converts 8-bit signed integer to 64-bit signed integer.
Module Example Public Sub Main() Dim numbers() As SByte = { SByte.MinValue, -1, 0, 10, SByte.MaxValue } Dim result As Long For Each number As SByte In numbers result = Convert.ToInt64(number) Console.WriteLine(result) Next End Sub End Module