Hi anjali as per your requirement we can do it as follows. you just gothrough the below example you will understand how to proceed further.
Validating a Checkbox Field
There is no RequiredValidator however for the Checkbox control. In
order to check whether a checkbox was ticked, you need to use a
CustomValidator. The CustomValidator allows you to create custom rules
for validation that can’t be satisfied by the other validator controls.
CssClass=”FieldError”Display=”Dynamic”ForeColor=”Red”
ValidationGroup=”ValidateForm”OnServerValidate=”cv1_ServerValidate”>
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protected void cv1_ServerValidate(object source,�
ServerValidateEventArgs args)�
{�
args.IsValid = terms.Checked;�
}
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.servervalidateeventargs.aspx
has two properties, IsValid and Value. In our example, the IsValid
state is set according to whether the checkbox is ticked. The Value
property is used for validating controls such as a TextBox where it will
contain the value in the field.
Finally. in the code that performs what ever action you need after the submit button is pressed you simply check for
Page.IsValid.
I hope this helps you a lot.
If possible please gothrough the below example also
Drawbacks of Server Side Validation for a Checkbox Field
The problem with this approach, is that the Checkbox validation
occurs server side, while all your other validation occurs client side.
This means that when a customer clicks submit without filling out the
form properly, the Name and Email validators will fire, but no message
will appear if the checkbox is not ticked.
If the name and email address fields are filled in correctly then the
form will postback on submit, and then return with a message saying
that the check box is not ticked.
To get around this, we add a client side check to the Checkbox by adding ClientValidationFunction=AgreeTerms:
CssClass="FieldError" Display="Dynamic" ForeColor="Red"�
ValidationGroup="ValidateForm" OnServerValidate="cv1_ServerValidate"�
ClientValidationFunction="AgreeTerms">
And then at the top of the page, add the following function:
Now all the controls validate on the client side, and as an added
bonus, the checkbox will check on the server side if the client has
Javascript disabled.