Convert.ToDouble (Int64) converts 64-bit signed integer to double-precision floating-point number.
Module Example Public Sub Main() Dim numbers() As Long = { Int64.MinValue, -903, 0, 172, Int64.MaxValue} Dim result As Double For Each number As Long In numbers result = Convert.ToDouble(number) Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _ number.GetType().Name, number, _ result.GetType().Name, result) Next End Sub End Module