Convert.ToInt32 (UInt64) converts 64-bit unsigned integer to an equivalent 32-bit signed integer.
Module Example Public Sub Main() Dim numbers() As ULong = { UInt64.MinValue, 121, 340, UInt64.MaxValue } Dim result As Integer For Each number As ULong In numbers Try result = Convert.ToInt32(number) Console.WriteLine(result) Catch e As OverflowException Console.WriteLine("The {0} value {1} is outside the range of the Int32 type.", _ number.GetType().Name, number) End Try Next End Sub End Module