when i run error appears string was not recognized valid date time

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C#

DateTime dateofbirth = Convert.ToDateTime(txt_DOB.Text);
  DateTime Weddingday  = Convert.ToDateTime(txt_wedding.Text);

    if (dateofbirth.Year !=1900)
    SendSMS(txt_DOB.Text.Trim());
    else
   if (Weddingday.Year != 1900)
   SendSMS(txt_wedding.Text.Trim());

run this code error shows "String Was Not Recognized a Valid Date Time";

from my above code what is the mistake or error or problem.please find out & help me.

Rgds,
narasiman P
Thanks,
Code Project.

Posted 29-Dec-12 2:54am

Member 8054539

Updated 29-Dec-12 3:25am

Krunal Rohit

v2

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Richard MacCutchan 29-Dec-12 9:00am

How can we guess? Look at the content of your text fields to see why they are not being recognised.

Oleksandr Kulchytskyi 29-Dec-12 9:01am

As far as i remember you have asked such question!

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OriginalGriff · Answer 1 · 2012-12-29T03:29:00

hen you use Convert.ToDateTime, it tries to parse the input string using the Culture settings of the computer that your code is running on. If the string input by the user is not in that format (for example, the user enters "29 Dec 2012" and your Culture is set to US and expects "12/29/2012") then you will get an exception. You will get the same problem if the user enters an invalid date such as "sdfs/wewe/22334"

There are two solutions: use TryParseExact[^] instead, and report the problem or the user, or prevent the user from entering a wrong date altogether by using a DateTimePicker[^] instead.

Personally, I prefer to prevent problems, and present the user with a "nicer" input method at the same time, so I use a DateTimePicker whenever possible.