multiple space check in textbox

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Hi,
How do check multiple space in textbox?

exp:

C#

if(textbox1.text == " '(more space)'") // Here is not working
{
  MessageBox.Show("empty");
}

if(textbox1.text == " ")Here is working
{
  MessageBox.Show("empty");
}

Thanks,
Karthikeyan
Bangalore.

Posted 3-Sep-12 20:44pm

pkarthionline

Updated 3-Sep-12 20:52pm

JF2015

v2

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2 solutions

Solution 1

Maybe you should use something like:

C#

if (String.IsNullOrWhiteSpace(textBox1.Text))
            MessageBox.Show("empty");

See here for an explanation:
http://msdn.microsoft.com/en-us/library/system.string.isnullorwhitespace[^]

Posted 3-Sep-12 20:50pm

JF2015

Updated 3-Sep-12 20:51pm

v2

Comments

pkarthionline 4-Sep-12 3:00am

But,
String.IsNullOrWhiteSpace is not show.

only show this one

if (String.IsNullOrEmpty(txtFieldName.Text))
MessageBox.Show("empty");

how i check more whitespace ?

JF2015 4-Sep-12 3:07am

The IsNullOrWhiteSpace may only be available for .NET 4

Timberbird 4-Sep-12 3:06am

I would only add that this check will give "empty" message even if textbox is actually empty (has no text at all, even spaces), which may be implied, but not technically requested by TS. Checking text length as well would fix it (if needed)

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VIPINVIVEK · Accepted Answer · 2012-09-03T20:51:00

Solution 2

C#

if(textbox1.Text.Trim().Length==0)
MessageBox.Show("empty");

Posted 3-Sep-12 20:51pm

VIPINVIVEK

Updated 3-Sep-12 21:11pm

v2

Comments

pkarthionline 4-Sep-12 3:26am

Thanks.