how to validate the text enter in the textbox after entering the complete in text in the textbox

[lakshmichawala]

iam having a textbox where iam entering some text say user id then after entering the userid in the textbox and if user goes for next control then how can i validate that the user id entered is already there in my db.which event of the textbox works better.

[Caio Kinzel Filho]

Well, actually in asp.net you don't have an event on the validation of the control like in windows forms, but you can do like the following: 1) Put a custom validator control in your form 2) Set its ControlToValidate to your Textbox 3) Add a function to your code like

protected void ValidateTextboxInDB(object source, ServerValidateEventArgs args)
{
    //Put the result of the validation in: 
    //args.IsValid
}

4. Bind the event handler to your method like:

   OnServerValidate="ValidateTextboxInDB"
   ControlToValidate="TextBox1"
   ErrorMessage="Your error message.">

Regards

Intelligence is almost useless for those who have nothing else! Email: caiokf@gmail.com

[lakshmichawala]

hi caiokf Thanks for ur immediate reply .but how to call this when textbox is lost focus means when user enters something in the textbox and comes out.

[balaji t]

hi Lakshmi, set ur textbox autopostback property to true in the properties pane of ur textbox. and in the textbox textchange event u can validate the userid against the userid in the DB.This is very simple.

T.Balaji