Convert.ToInt64 (UInt16) converts 16-bit unsigned integer to the equivalent 64-bit signed integer.
Module Example Public Sub Main() Dim numbers() As UShort = { UInt16.MinValue, 121, 340, UInt16.MaxValue } Dim result As Long For Each number As UShort In numbers Try result = Convert.ToInt64(number) Console.WriteLine(result) Catch e As OverflowException Console.WriteLine("The {0} value {1} is outside the range of the Int64 type.", _ number.GetType().Name, number) End Try Next End Sub End Module