code to input date-time using InputBox

Here is my code to input date-time using InputBox
with default date-time = today at 9 pm
I thought others might be interested or suggest improvements

vb.net Code:

Dim KeepOn As Boolean
        Dim DateDefault As Date
        Dim strDate As String
        Dim Date1 As DateTime
        Dim MyDateFmt As String = "dd/MM/yyy HH:mm:ss"
 
        DateDefault = DateAdd("h", 21, Today()) 
       ' Today 00 hours plus 21 hours 
        KeepOn = True
 
        While KeepOn
            strDate = InputBox(" Enter date with format " + MyDateFmt, , _
                               Format(DateDefault, MyDateFmt))
 
            Try
                Date1 = DateTime.Parse(strDate)
                KeepOn = False
                MsgBox(" No error detected in date.parse.  Proceed"  _
                           + Date1.ToString)
                    
            Catch ex As Exception
                MessageBox.Show("Exception in Date.Parse" + _
                           vbNewLine + " Date string = " + strDate + _
                           vbNewLine + "Exception Type: " _
                            + ex.GetType.ToString + _
                           vbNewLine + "Exception Message: "  _
                           + ex.Message, "Exception", _
                           MessageBoxButtons.OK, MessageBoxIcon.Error) 
                KeepOn = True
            End Try
 
        End While

My first advice would to never use InputBox and, if you want the user to enter a date and/or time, display your own dialogue with a DateTimePicker control.

Next, using Date.Parse inside a Try...Catch block is bad practice. When you don't know that the input will be valid you should be using TryParse, which doesn't throw an exception if it fails.

Finally, if you're expecting input in a specific format, as you are, then you need to enforce that format. To do that you use ParseExact in preference to Parse and TryParseExact in preference to TryParse.

The less critical issues involve getting rid of all those Runtime and using .NET standards.