Convert.ToInt64 (Decimal) converts decimal number to 64-bit signed integer.
Module Example Public Sub Main() Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _ 199.55d, 1111.16d, Decimal.MaxValue } Dim result As Long For Each value As Decimal In values Try result = Convert.ToInt64(value) Console.WriteLine(result) Catch e As OverflowException Console.WriteLine("{0} is outside the range of the Int64 type.", _ value) End Try Next End Sub End Module