Convert.ToUInt64 (UInt32) converts 32-bit unsigned integer to 64-bit unsigned integer.
Class Sample Public Shared Sub Main() Dim numbers() As UInteger = { UInt32.MinValue, 121, 340, UInt32.MaxValue } Dim result As ULong For Each number As UInteger In numbers result = Convert.ToUInt64(number) Console.WriteLine(result) Next End Sub End Class