Web Forms :: If A Textbox Is Not Valid Stop Postback?

Aug 10, 2010

i have a textbox where the user needs to type in his phone number and the submit the detials but if the textbox is les than 8 caracters and he or she clicks the button

then it must stop that button doing a post back and refresing the page

is this possible herei an expamle code

[Code]....

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[Code]....

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[Code]....

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[Code]....

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so everytime it's displaying me result even if i do postback

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[Code]....

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[Code]....

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 ps. How copy text from your forum, is not allow?

Source: 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CS.aspx.cs" Inherits="CS" %>
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[code]....

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Code:

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HTML

Quote:

[code]....

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Below is my code:

<asp:TextBox
ID="FromDateTextBox"
runat="server" />
<asp:ImageButton
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oninvalidcssclass="MaskedEditError"
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acceptnegative="Left"..........

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UPDATE

I know how to create a javascript click handler. But because masked editor is already validating the date on focus shift, I'm thinking there should be some boolean property (like IsValid) exposed by it which will allow me to see if the text box contains valid date.

FURTHER TRIALS

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I have a FormView that allows a user to register for a company event. I want to do a couple of things with this form.

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[Code]....

[Code]....

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[Code]....

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