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Validating two dates in ASP.net C#

Posted on 2006-10-31
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Last Modified: 2012-06-27
Hello Experts,

In our Meeting schedule application, we have two date fields, Meeting Start Date/Time and Meeting End Date/Time.

How do I validate the two date/time such that, end date/time cannot be prior to StartDate/Time and StartDate time cannot be prior to currentDatetime.

DatTime is a usercontrol which contains a textbox and a reqd field validator to check null.

Thanks in advance for your help
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Question by:rowmark
5 Comments
 
LVL 35

Expert Comment

by:YZlat
ID: 17843470
use CompareValidator
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LVL 96

Accepted Solution

by:
Bob Learned earned 200 total points
ID: 17843471
One way would be to create a custom date validator.

Here are some examples:

Writing a Custom Validator Control in ASP.NET
http://www.c-sharpcorner.com/Code/2002/May/DateCustomValidator.asp

Date Validator Custom Web Control
http://www.codeproject.com/aspnet/datevalidator.asp

Bob
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LVL 10

Assisted Solution

by:jnhorst
jnhorst earned 200 total points
ID: 17843602
The DateTime class has a Subtract() method that returns a TimeSpan object.  Your code would look something like this:

DateTime start = DateTime.Parse("the date in your start textbox");
DateTime end = DateTime.Parse("the date in your end textbox");
TimeSpan diff = end.Subtract(start);

if (diff.TotalDays < 0)
{
     //... code would get here if end was earlier than start.
}

You can do the same with the start date and the current date, like this:

TimeSpan startDiff = start.Subtract(DateTime.Now);

if (startDiff.TotalDays < 0)
{
     // code would get here if the start day was before today.
}

John
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LVL 6

Assisted Solution

by:Roopesh_7
Roopesh_7 earned 100 total points
ID: 17843869
hi,
if there is only reqd field validator to check null then first you need to check the enterd date is valid or not....i think better to use a client side function for that to validate date then you can doo the above stuf....
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Author Comment

by:rowmark
ID: 17844340
Thank you all for your help.

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