If (textbox.name == null) ? Howto

[Gohalien]

I am writing some code, and I wanna "ask" if an object name is not null (aka, the object exist) then do some work, else, do other work...

Of course, by doing "If (textbox.name == null)" I get the error NullReferenceException.

Example of what I want to do in a function that have a public textbox object:
private TextBox det;
public TextBox Det
{
get { return det; }
set { det = value; }
}


if (det.Name != "")
{
Funciones.Detalle(det, CodBrowse, this.Text);
}

[shweta123]

Hi,

Please check with isDBNull instead of null.
e.g.

If IsDBNull(textbox.name) = True

end if

[TRScheel]

Hi,

Please check with isDBNull instead of null.
e.g.

If IsDBNull(textbox.name) = True

end if

Actually, I believe he's trying to see if the textbox exists... instead of

if (det.Name != null)

he should just do

if (det != null)

[jaeden99]

'This checks to see if there are spaces in a textbox(if textbox is empty).
'I'm not sure if the textbox field qualifies for null. I think we only use that in database fields(or instances).

Are you trying to see if the textbox is empty?

if textboxname.text = " " then

'code to do what you want or not want

end if

[TRScheel]

'This checks to see if there are spaces in a textbox(if textbox is empty).
'I'm not sure if the textbox field qualifies for null. I think we only use that in database fields(or instances).

Are you trying to see if the textbox is empty?

if textboxname.text = " " then

'code to do what you want or not want

end if

Use string.Empty instead of ""

If tomorrow they changed what an empty string was declared as, you would have to change all your code, but if you used string.Empty, it would be updated for you.

[teakwood85]

Try to use String.IsNullOrEmpty();

-Jati