Adding leading zeros to NumericUpDown Control

[Joe Cool]

I am trying to force a numericupdown control to display leading zeros.
The maximum is less than 100, so the displayed value will always be a
two digit number or less. So I have overridden the OnValueChanged
Event with the following code;

protected override void OnValueChanged(EventArgs e)
{
base.OnValueChanged(e);
if (Value < 9)
Text = Value.ToString("00");
}
But it doesn't work. Can anyone spot the problem?

[Cor Ligthert[MVP]]

Joe,

Why not simple the standard key up event, there are so many events for this
and you to the difficult route?
Cor
"Joe Cool" <jo*****@home.netschreef in bericht
news:fh********************************@4ax.com...

>I am trying to force a numericupdown control to display leading zeros.
The maximum is less than 100, so the displayed value will always be a
two digit number or less. So I have overridden the OnValueChanged
Event with the following code;

protected override void OnValueChanged(EventArgs e)
{
base.OnValueChanged(e);
if (Value < 9)
Text = Value.ToString("00");
}
But it doesn't work. Can anyone spot the problem?

[=?Utf-8?B?TW9ydGVuIFdlbm5ldmlrIFtDIyBNVlBd?=]

Hi Joe,

ValueChanged is fired when the Value property is changed, and any Text
changed at this point would get overwritten by the Control at a later stage.

You can, however, achieve the padding by overriding OnTextBoxChanged

protected override void OnTextBoxTextChanged(object source, EventArgs e)
{
Text = Value.ToString("00");
}

but you will lose the ability to manually enter the value.

If you change to Text = Text.PadLeft(2, '0'); you can manually enter a
value, but you are no longer limited to maxvalue, and the user input is not
logical, but you may be able to work something out.

--
Happy Coding!
Morten Wennevik [C# MVP]
"Joe Cool" wrote:

I am trying to force a numericupdown control to display leading zeros.
The maximum is less than 100, so the displayed value will always be a
two digit number or less. So I have overridden the OnValueChanged
Event with the following code;

protected override void OnValueChanged(EventArgs e)
{
base.OnValueChanged(e);
if (Value < 9)
Text = Value.ToString("00");
}
But it doesn't work. Can anyone spot the problem?

[Joe Cool]

On Sun, 16 Mar 2008 23:30:01 -0700, Morten Wennevik [C# MVP]
<Mo************@hotmail.comwrote:

>Hi Joe,

ValueChanged is fired when the Value property is changed, and any Text
changed at this point would get overwritten by the Control at a later stage.

You can, however, achieve the padding by overriding OnTextBoxChanged

protected override void OnTextBoxTextChanged(object source, EventArgs e)
{
Text = Value.ToString("00");
}

but you will lose the ability to manually enter the value.

That is fine with me.

>
If you change to Text = Text.PadLeft(2, '0'); you can manually enter a
value, but you are no longer limited to maxvalue, and the user input is not
logical, but you may be able to work something out.

Thanks for your informative reply.

[Joe Cool]

On Sun, 16 Mar 2008 23:30:01 -0700, Morten Wennevik [C# MVP]
<Mo************@hotmail.comwrote:

>Hi Joe,

ValueChanged is fired when the Value property is changed, and any Text
changed at this point would get overwritten by the Control at a later stage.

You can, however, achieve the padding by overriding OnTextBoxChanged

protected override void OnTextBoxTextChanged(object source, EventArgs e)
{
Text = Value.ToString("00");

No go. This statement throws a StackOverflowException.

>}

but you will lose the ability to manually enter the value.

If you change to Text = Text.PadLeft(2, '0'); you can manually enter a
value, but you are no longer limited to maxvalue, and the user input is not
logical, but you may be able to work something out.