how to validate the text box in .net windows form application

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as i want to validate my textbox. i want that my text box should not be empty at the form submit ion. it must take some value as input but not whitespace.
i have use this:

if(textbox.text=="")
{
errorProvider1.show(textbox,"plese enter your name");

}

this will take white space as input which is not my requirement .

please help me..

Posted 6-Feb-14 19:07pm

Abhijeet pratap singh

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Comments

Tom Marvolo Riddle 7-Feb-14 1:22am

Try it & let me know

3 solutions

Solution 3

use String.IsNullOrWhiteSpace(textbox.Text)

C#

if (String.IsNullOrWhiteSpace(textbox.Text))
{
     errorProvider1.show(textbox, "plese enter your name");
}

Posted 6-Feb-14 19:33pm

good.shankar

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Karthik_Mahalingam · Accepted Answer · 2014-02-06T19:24:00

Solution 2

use Trim[^]

C#

if (textbox.Text.Trim() == "")
                {
                    errorProvider1.show(textbox, "plese enter your name");
                }

Posted 6-Feb-14 19:24pm

Karthik_Mahalingam

Comments

Siva Hyderabad 7-Feb-14 4:11am

+5

Karthik_Mahalingam 7-Feb-14 4:16am

Thanks siva:)

Tom Marvolo Riddle · Accepted Answer · 2014-02-06T19:18:00

Solution 1

Try this:

C#

if (textBox1.Text.Trim()==string.Empty)
  {
 errorProvider1.show(textbox,"plese enter your name");
  }

Posted 6-Feb-14 19:18pm

Tom Marvolo Riddle

Comments

Abhijeet pratap singh 7-Feb-14 1:36am

what the functionality of Trim

Tom Marvolo Riddle 7-Feb-14 1:37am

It Removes whitespaces