Please help old vb programmer with custom validation control

[Sarah Katon]

Hi all.

I'm fairly new to VB.net, and I have very little experience with Javascript.
I'm trying to get a Client Side Custom Validator to work for many
interrelated controls. I'd like to check several fields and update the
Error Message on the fly, and then have at least one error message shown in
a message box.

How do I write the Javascript? Should it be in the html code behind the
form? Or do I use the append function? I've looked all over the web for an
example written with the append function, but I can't find anything
adaptable to my situation.

Any help is greatly appreciated!!

Sarah

[Sarah Katon]

Below is an example of the error validation code that I need to implement
for one of the controls.
Private Sub cvEffDate_Clien tValidate(ByVal source As System.Object, ByVal
args As System.Web.UI.W ebControls.Serv erValidateEvent Args) Handles
cvEffDate.Serve rValidate

If Convert.ToStrin g(txtEffectiveD ate.Text).Lengt h = 0 Then

cvEffDate.Error Message = "Please enter an Effective Date."

args.IsValid = False

Else

Select Case Convert.ToDateT ime(txtEffectiv eDate.Text)

Case Is < System.DateTime .Now.AddDays(1)

cvEffDate.Error Message = "The Effective Date must be at least one day in
advance of current date."

args.IsValid = False

Case Is > System.DateTime .Now.AddMonths( 3)

cvEffDate.Error Message = "The Effective Date is more than three months from
the current date."

args.IsValid = False

Case Is < System.DateTime .Now.AddMonths(-3)

cvEffDate.Error Message = "The Effective Date is more than three months prior
to the current date."

args.IsValid = False

Case Is < #7/1/2004#

cvEffDate.Error Message = "The Effective Date must be July 2004 or greater."

args.IsValid = False

Case Else

args.IsValid = True

End Select

End If

End Sub