Convert.ToInt64 (UInt32) converts 32-bit unsigned integer to 64-bit signed integer.
Module Example Public Sub Main() Dim numbers() As UInteger = { UInt32.MinValue, 121, 340, UInt32.MaxValue } Dim result As Long For Each number As UInteger 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