Convert.ToSByte (Decimal) converts decimal number to 8-bit signed integer.
Module Example Public Sub Main() Dim numbers() As Decimal = { Decimal.MinValue, -129.5d, -12.7d, 0d, 16d, _ 103.6d, 255.0d, Decimal.MaxValue } Dim result As SByte For Each number As Decimal 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