Convert.ToDouble (UInt64) converts 64-bit unsigned integer to double-precision floating-point number.
Module Example Public Sub Main() Dim numbers() As ULong = { UInt64.MinValue, 121, 12345, UInt64.MaxValue } Dim result As Double For Each number As ULong In numbers result = Convert.ToDouble(number) Console.WriteLine("Converted the UInt64 value {0} to {1}.", _ number, result) Next End Sub End Module