CODEWITHSUNDEEP
c#asp.net
Hemant Kothiyal
Hemant Kothiyal

Reputation: 4142

Clearing a TextBox in ASP.NET

I have webpage where there is textbox with some default value. I have to clear that value from the textbox. I have two options:

textbox.text="";

or

textbox.text.remove(0,length);

Which one should I use? Does it make any impact on page performance (there are many textboxes placed on my page)?

Upvotes: 8

Views: 61292

Answers (6)

this. __curious_geek
this. __curious_geek

Reputation: 43207

The best way to do this is

textbox.text = string.Empty;

Also remember that string type is immutable!

Upvotes: 28

venky
venky

Reputation: 11

textbox.text="";

or

 foreach (var item in Page.Controls)
    {
        if (item is TextBox)
        {
            ((TextBox)item).Text = "";
        }
    }

Upvotes: 1

John Saunders
John Saunders

Reputation: 161773

  1. The performance difference between the two options will be too small to measure, most likely.
  2. TextBox.Text = String.Empty; is a lot more readable. It clearly states what you're trying to do: "set the text property of this text box to an empty string".

I recommend you go with the assignment, as it is both faster, and much more clear.

Upvotes: 3

Sam Salisbury
Sam Salisbury

Reputation: 1106

The impact on performance will be minimal even with hundreds/thousands of calls, however

textbox.text = "";

should in theory be very slightly quicker, since you're just assigning a new value rather than processing the string (as .Remove does)

The best way to do this would be to do

textbox.text = String.Empty;

Update: if you're counting clock-cycles, String.Empty will actually execute faster as well, because it doesn't create a new object, whereas "" will create a new String object.

However, you should really not be too concerned about this, there aren't many ways to set a string to empty that will cause performance issues! You should use whichever is the most readable...

Upvotes: 0

flesh
flesh

Reputation: 23935

Presumably, you mean clear the value with javascript when a user clicks int the box? If so, it won't make any difference to performance.

I use jQuery in most pages, so I just hook up this function to clear default values onClick, using the ClientId of the textbox:

$('#ctl00_TextBox').click(function() { $('#ctl00_TextBox').val('');

If you mean clear it in codebehind use this:

yourTextBox.Text = String.Empty;

Upvotes: 1

Rex M
Rex M

Reputation: 144112

It makes no difference - do what is most readable for you and your colleagues.

Many prefer to use string.Empty.

Upvotes: 9

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