How to convert string to a DateTime and compare it with another DateTime

VB.NET

Dim blntimeIsOk As Boolean = DateTime.Parse('15:00') < DateTime.Parse('08:00')
Response.Write(blntimeIsOk)

C#

bool blntimeIsOk = (DateTime.Parse('15:00') < DateTime.Parse('08:00'));
Response.Write (blntimeIsOk);