Convert.ToSByte (Byte) converts 8-bit unsigned integer to 8-bit signed integer.
Module Example Public Sub Main() Dim numbers() As Byte = { Byte.MinValue, 10, 100, Byte.MaxValue } Dim result As SByte For Each number As Byte In numbers Try result = Convert.ToSByte(number) Console.WriteLine(result) Catch e As OverflowException Console.WriteLine("The {0} value {1} is outside the range of the SByte type.", _ number.GetType().Name, number) End Try Next End Sub End Module