Error: string was not recognized as a valid datetime

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Hi Everyone...
I am creating a project where i need to convert text box value into date time every time i have faced an error.. below is my code.

What I have tried:

C#

public int Validate_DOB()
   {
       DateTime dt = DateTime.Parse(txt_DOB.Text);//error occured at this line of code
       int Validate = DateTime.Now.Year - dt.Year;
       return Validate;
   }

Posted 20-Dec-16 18:02pm

Muhammd Aamir

Updated 20-Dec-16 18:14pm

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Mehedi Shams · Accepted Answer · 2016-12-20T18:14:00

Solution 2

Hi Aamir,

The error is clear from the error msg - the value in the text box is not a datetime. You can use TryParse() as Peter suggested. Or you can catch a FormatException to let the user know about the problem at runtime.

C#

try
{
    DateTime dt = DateTime.Parse(txt_DOB.Text);//error occured at this line of code
    int Validate = DateTime.Now.Year - dt.Year;
}
catch (FormatException)
{
    MessageBox.Show("This is not a valid date time.");
}

Posted 20-Dec-16 18:14pm

Mehedi Shams

Comments

Muhammd Aamir 21-Dec-16 0:23am

Thankx Mehedi Shams for sharing your knowledge .... i have done this with calendar extender now there is no string format error...

Muhammd Aamir 21-Dec-16 0:51am

Hi Mehedi Shams my function return type is integer how can i show alert message...

public int Validate_DOB() // error here not all code path return a value
{
try
{
DateTime dt = DateTime.Parse(txt_DOB.Text);
int Validate = DateTime.Now.Year - dt.Year;
return Validate;
}
catch (FormatException ex)
{
Response.Write("alert('" + Server.HtmlEncode(ex.ToString()) + "')");
}

}

Mehedi Shams 21-Dec-16 1:09am

Hi Aamir,

Do you mean you want to display the error as a message box? You can use the following code in the exception block:

ClientScript.RegisterStartupScript(this.GetType(), "App Alert", "alert('This is not a valid date time.');", true);

Peter Leow · Accepted Answer · 2016-12-20T18:09:00

Solution 1

You should use DateTime.TryParse[^]
Alternatively, consider using a datatimepicker to let users select a date rather than a text box that allow free form text. Check this out: Implement DateTimePicker in ASP.Net using jQuery Plugin[^]

Posted 20-Dec-16 18:09pm

Peter Leow

Updated 20-Dec-16 18:15pm

v3

Comments

Muhammd Aamir 21-Dec-16 0:15am

Thankx Peter Leow... [^] this sign indicates to which type of parameter

Peter Leow 21-Dec-16 0:17am

It is link to open a page on a new tab.

Muhammd Aamir 21-Dec-16 0:21am

Oh great Peter Leow You Solve my problem i use calendar extender in text box and now user can select from calendar extender and can select in a correct formate thankx a lot good job done by you