C# DateTimePicker problem

Ari

Hey, I'm trying to use some basic input validation for two dateTimePicker controls in an application I'm building.

I'm trying to set it so that the issueDatePicker's value or date & time must be smaller (less than) that of the dueDatePicker's value or date & time.

I'm using this code which seems correct but just isn't working..

if (issueDatePicker.Value >= dueDatePicker.Value)

{

MessageBox.Show("The due date must be greater than the issue date", "Input Error");

}

else

{

issueDate = issueDatePicker.Value;

dueDate = dueDatePicker.Value;

dateCorrect = true;

}

The above code is within a button click event.

Any help is appreciated.

2 Replies

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Pravin Ghadge14y ago
Hi Ari,
You can try this:
if (convert.todatetime(issueDatePicker.Value.ToshortDateString()) >= convert.todatetime(dueDatePicker.Value.ToshortDateString())
{
MessageBox.Show("The due date must be greater than the issue date", "Input Error");
}
else
{
issueDate = issueDatePicker.Value;
dueDate = dueDatePicker.Value;
dateCorrect = true;
}

Mamta M14y ago

You can't use >= to compare two dates. Use the Compare function as shown below:

(DateTime.Compare(d1,d2) where d1 and d2 are the dates retrieved from your datepicker controls.

The output of the method will be one of three values:

Value Type	Condition
Less than zero	d1 is earlier than d2.
Zero	d1 is the same as d2.
Greater than zero	d1 is later than d2.