How to validate date in C#

Question

0.00/5 (No votes)

See more:

i am creating class to inherit TextBox for Date.

Onlostfocus i want to check if text entered is valid date.

How to validate date in C#.

Thanks

What I have tried:

protected override void OnLostFocus(EventArgs e)
       {
           base.OnLostFocus(e);

           if (this.Text = DateTime)

           {

           }
           else
           {
               MessageBox.Show("Invalid Date");
           }

       }

Posted 13-Mar-20 12:22pm

pravin9455

Updated 13-Mar-20 12:26pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

phil.o · Accepted Answer · 2020-03-13T12:27:00

DateTime.TryParse Method (System) | Microsoft Docs[^]

This method is perfect to know whether a string is a valid datetime representation.

C#

protected override void OnLostFocus(EventArgs e)
{
   base.OnLostFocus(e);

   if (DateTime.TryParse(Text, out DateTime theDate))
   {
      // ...
   }
   else
   {
      MessageBox.Show("Invalid Date");
   }
}

As a side note: why not using a DateTimePicker instead, which is the control specifically designed to input and display datetime values?