label event? label.text changed?


a event exists that occures when the text of a lable is changed?

textbox got such an event.

but I couldnt find it for labels


my task is

i got labels, if they are empty another label shows that they must be filled with text (this works trough a popup by selecting data from a gridview this popup makes an dialog return and sets the text of the label)

so if all labels != null or != "" the other label(showing that the labels are required) should be invisible




6/26/2008 8:12:42 AM 93655 articles. 6 followers. Follow

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Labels dsnt have OnTextChanged type any event.


You can check it like this -



 lblMessage.visible = true;

 lblMessage.Text = "Labels cant be blank."; 



    lblMessage.visible = false;



Better option is that you get your data to TextBoxes with Enabled property set to false and put RequiredFieldValidators for them.

Hope it helps.


If this post is useful to you, please mark it as answer.
6/26/2008 9:04:22 AM


thanks to you first!


but required field validators are bad

If you got any other buttons in the page, the opens a popup to apply data in a label

all buttons on the site are blocked if the required field validator  says your field to validate is empty

any solution for that?




6/26/2008 9:43:57 AM

 Use RequiredFieldValidators.

 Let you have 2 buttons on page - btn1 and btn2.

 Now you want that btn1 should check for required fields and btn2 should not.

 set CausesValidation property of btn2 to false. now only btn1 will check for required fields.


Validators are not  bad. Thay have an added advantage, they validate the controls on client as well as on server too.


Hope it helps.


If this post is useful to you, please mark it as answer.
6/26/2008 9:51:10 AM


thanks! that was always getting on my nerves...

but then if have to set to all buttons the "causesvalidation = "false" attribute

Ill have a try..


6/26/2008 10:38:48 AM

 I still got problem with the required validator

for some things to validate I need a custom validator

ok now, the required validater fires before the customvalidator. so if your field, which got the required validator, is empty and not the first

and the fields before the field with the required validator have custom validators

Im forced to first type in the data to the field with the required field validator, before the customvalidator can check (when you click insert in detailsview)

this is very annoying

 can you tell me how to avoid this?
thanks :)

hurzwurz Big Smile

6/26/2008 1:17:16 PM

 We always dont need custom validator.

 A lot of things can be validated through Compare validator and Regular expression Validator.

 Yes custom validator checks it in last.

 Well what you want - javascript can do this - without a custom validator.


Hope it helps.


If this post is useful to you, please mark it as answer.
6/26/2008 1:27:14 PM

 and if you want to validate things like this:

the textbox can be empty, but also can have values and the string length is between 0 and 200 chars

or the textbox.text must not be longer than 20 chars 

in both cases Alphanumeric characters(lower/upper) and all special charachters are allowed

 how would you do this?

thanks for your advice

6/26/2008 1:38:08 PM
 Well what you want - javascript can do this - without a custom validator.

Well to restrict user for Maximum length there is a maxlength property of textbox.

by default all alphanumeric and special characters are allowed. 

Hope it helps.


If this post is useful to you, please mark it as answer.
6/26/2008 1:43:28 PM

 Thanks a lot!

 But doesnt this makes the Detailsview Row very big? the validators  capture space...


Have a nice day

6/26/2008 2:47:58 PM

 Well it takes space in ur/users design. not when u view it in browser.

 one of the properties of validators is display -> dynamic.

try that. 

Hope it helps.


If this post is useful to you, please mark it as answer.
6/26/2008 4:54:39 PM

thanks for your endurance



though you are very capable

I may ask another question not fitting to the task (buts the theme already drifted away from it, doesnt it?)


If I type text in a textbox and than use a button to open a popup and selecting there data that is then apllied to a label

sometimes it appears that the text of the textbox is emptied by clicking on the button or redirecting for the popup

any idea Idea ?


6/27/2008 11:31:06 AM

 In this scenario, put the data in <asp:Hidden field> and access it to apply any where.

 txtBox - > hidden field - > lable.


Well what exactly is the problem, it can be determined only after looking at the code. 

Hope it helps.


If this post is useful to you, please mark it as answer.
6/27/2008 11:57:26 AM

 the textobx and the label are in two different rows of the detailsview

it seems that after a postback etc.

the text of the textbox is not saved

i got another page where the code seems to be the same, but there the textbox isnt emptied

after clicking on the button


6/27/2008 12:24:36 PM

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