problem with datetimetoshort in windows form

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I have two labels a windows form.

label1 is for displaying EnteredDate and label2 for UpdatedDate for a member,

i inserted date in db as datetime.toshortstring() to get only date.
these label get values from db using datareader.
while displaying also i used datetime.toshortstring();

Now problem i got is Updateddate is null unless the member is updated.

so when any row is clicked in datagridview of member whose updated date is null, system crashed saying invalid string for datetime format.

without toshortstring function, time is also displayed which is not required.

i used datatype in sql database as Date.

i need only date to be displayed in label which is stored in database.

any hints would be appreciated.

thanks in advance

Posted 12-Jul-11 16:15pm

sanomama

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Comments

Dr.Walt Fair, PE 12-Jul-11 22:40pm

Is the error when reading from the DB and displaying or when trying to save back to the DB?

4 solutions

Solution 1

which version of SQL you are using?

Posted 12-Jul-11 17:16pm

sk saini

Comments

sanomama 13-Jul-11 0:18am

microsoft sql server 2008

Solution 2

Save date to database in normal DateTime format. And convert to Date.ToShortString() while binding to DataGridView column (or as you needed).

Posted 12-Jul-11 18:09pm

sk saini

Solution 4

Assign the actual value to Nullable DateTime object. Then check HasValue and use it.

Example:

C#

DateTime? dateTime = [DB VALUE];

if (dateTime.HasValue)
{
    // use your logic to show dateTime.ToShortString();
}

Mark it as answer if it is helpful.

Posted 12-Jul-11 18:39pm

Venkatesh Mookkan

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Ger Hayden · Accepted Answer · 2011-07-12T18:39:00

When you read it back in, examine the date for a null value. If it is null set a tmpStrDate (defined as a string) to null, otherwise put the date in this field. Use that string value to feed into your datatset. e.g.

	if (reader->IsDBNull(4) == false)
	{
	    tmp_strValidTo = reader->GetDateTime(4).ToShortDateString();
        }
	else
	{	
	   tmp_strValidTo = nullptr;
	}
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