asked on

prevent multiple form submission

I have a 1 btnSubmit button that sends an email. users do multiple clicks and we receive all emails. How to avoid this? I did a research and tried a few codes but non of them worked.

This is my code for the button:

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Private Sub btnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubmit.Click

Try
Dim objMail As New MailMessage
objMail.From = "email1"
objMail.To = "email2"
objMail.Subject = "Form"
objMail.BodyFormat = MailFormat.Html

objMail.Body = "<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">" & vbCrLf _
& "<body>" & vbCrLf _
& "</body>" & vbCrLf _
& "</html>" & vbCrLf

SmtpMail.SmtpServer = "192.100.00.104"

SmtpMail.Send(objMail)

Catch ex As Exception

lblError.Visible = True
lblError.Text = ex.Message

End Try

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thanks,

ainaks25

ASKER

I found the solution:

<SCRIPT language=JavaScript >

var submitcount=0;

function checkSubmit()
{

if (submitcount == 0)
{ submitcount++; return true; }
else
{ alert('This form has already been submitted.' ); return false; }

}

</SCRIPT>

and

<form id="Form1" name="MainForm" method="post" runat="server" onSubmit=" return checkSubmit();" >

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ASKER CERTIFIED SOLUTION

RomMod

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