check whether a textbox is empty

[Yuelin]

Hi there

What's the best way of checking whether a textbox is empty? Thanks.

Yuelin

[Chris Capel]

If you want to ignore spaces, then

textBox1.Text.Trim() == ""

otherwise use

textBox1.Text == ""

Chris
"Yuelin" <li***@lineone.net> wrote in message
news:#O*************@TK2MSFTNGP12.phx.gbl...

Hi there

What's the best way of checking whether a textbox is empty? Thanks.

Yuelin

[Mark Marsella]

In article <#O*************@TK2MSFTNGP12.phx.gbl>, li***@lineone.net says...

Hi there

What's the best way of checking whether a textbox is empty? Thanks.

Yuelin

Subclass TextBox and add a IsEmpty Method

class MyTextBox : TextBox
{

public bool IsEmpty()
{
return (TextBox.Text == "")
}

}
--
Thanks
Mark Marsella

[Chris Capel]

Seems a bit excessive...
"Mark Marsella" <ne**@tersus-solutions.com> wrote in message
news:MP************************@news.cis.dfn.de...

Subclass TextBox and add a IsEmpty Method

[Nick Berardi]

The more .Net oriented way is to use

TextBox.Text == String.Empty

It doesn't really matter but it goes back to that magic number thing.
There should never be an instance theoretically that you should ever
have to put a string or number in your program.

Nick

Mark Marsella wrote:

In article <#O*************@TK2MSFTNGP12.phx.gbl>, li***@lineone.net says...

Hi there

What's the best way of checking whether a textbox is empty? Thanks.

Yuelin

Subclass TextBox and add a IsEmpty Method

class MyTextBox : TextBox
{

public bool IsEmpty()
{
return (TextBox.Text == "")
}

}

[Gregory Persson]

I always do

textBox1.Text.Length == 0

I read somewhere that checking the string's length is a faster operation.
Although the performance gain would probably only be useful in a loop, and
there's little chance you're doing this in a loop...

~Greg

"Chris Capel" <ch***@nowhere.com> wrote in message
news:#c**************@TK2MSFTNGP10.phx.gbl...

If you want to ignore spaces, then

textBox1.Text.Trim() == ""

otherwise use

textBox1.Text == ""

Chris
"Yuelin" <li***@lineone.net> wrote in message
news:#O*************@TK2MSFTNGP12.phx.gbl...

Hi there

What's the best way of checking whether a textbox is empty? Thanks.

Yuelin