DateTime Problem in Asp.net

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I have got two TextBoxes(txtdateofissue and txtdateofexpiry).The First Textbox is Attached with a CalendarExtender control.
I want that if a user selects a date for the txtdateofissue textbox then automatically the same date but next year should get entered in txtdateofexpiry textbox.
Date Should be in dd-MM-yyyy format i.e. 24-04-2013.
i have written a code for this but i am getting an error (String is not a valid datetime format)

my code:

C#

protected void txtdateofIssue_TextChanged(object sender, EventArgs e)
        {
            DateTime dt = Convert.ToDateTime(txtdateofIssue.Text);
            dt = dt.AddDays(-1).AddYears(1);
            txtdateofExpiry.Text = dt.ToShortDateString();
        }

the first line in which i declare datetime variable dt throws up the error (String is not a valid datetime format)

when i run this code in my local machine it works fine but if i run it on iis then it shows errors...please either correct my code or guide me in a new way...thanks in advance...

Posted 23-Apr-13 18:44pm

avinash_thakur86

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Rockstar_ 24-Apr-13 0:54am

On other system or same system?

avinash_thakur86 24-Apr-13 1:01am

on other system

Rockstar_ 24-Apr-13 1:02am

Check the date format of that system and ur system, may be it is different.

3 solutions

Solution 4

set Format="dd/MM/yyyy" attribute for calendar extender and change ur textchanged event as follows

C#

protected void txtdateofissue_OnTextChanged(object sender, EventArgs e)
   {
       string[] str = txtdateofissue.Text.Trim().Split('/');
       System.DateTime dt = new System.DateTime(int.Parse(str[2]), int.Parse(str[1]), int.Parse(str[0]));
       dt = dt.AddDays(-1).AddYears(1);
       txtdateofexpiry.Text = dt.ToShortDateString();
   }

Posted 23-Apr-13 20:36pm

JaffreenaMichael

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-04-23T19:13:00

Don't use all those Convert methods, try to avoid them in general. Do what you really mean to do — parsing. By two reasons: 1) the word "parse" helps you to understand what you really do; 2) parsing methods allows you to add parameters to specify format/culture of the string presentation of time, according to the string you expect.

You need to use one of the methods of the structure System.DateTime: Parse, TryParse, ParseExact or TryParseExact. Please see:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^].

For format specifiers, please see:
http://msdn.microsoft.com/en-us/library/az4se3k1.aspx[^],
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx[^].

—SA

avinash_thakur86 · Accepted Answer · 2013-04-23T19:34:00

Solution 3

C#

DateTime dt;
if (DateTime.TryParseExact(txtdateofIssue.Text, "dd-MM-yyyy",CultureInfo.InvariantCulture,DateTimeStyles.None,out dt))
{
   dt = dt.AddDays(-1).AddYears(1);
   txtdateofExpiry.Text = dt.ToString("dd-MM-yyyy");
}

Posted 23-Apr-13 19:34pm