Hi,

I have done the following coding:

        public override void ApplyEditChanges()
        {
            try
            {
                ValidateSignPost()
                base.SetValue(strSelectedValue);
            }
            catch
            {
            }
        }
        public void ValidateSignPost()
        {

            List<ListItem> LstTest = new List<ListItem>();
            if (CurrentPage["HideSignPost"] != null &&
                    (CurrentPage["SignPost1"] != null))
            {
                LstTest = lbSignPost.Items.OfType<ListItem>().Where(a => a.Selected).ToList();
                if (LstTest.Any(li => li.Value == (CurrentPage["SignPost1"].ToString())))
                {
                    AlertAndClose();
                }
            }
        }

        protected void AlertAndClose()
        {
            this.Page.Response.Write(@"<script language='javascript'>alert('Sign Post and Hide Sign Post Values should not be the same.');</script>");
        }

With this code when I click on Save and Publish, I'm able to see an alert message but after closing the alert box I'm seeing that the page is published.

Is there any way that we can stop loading the page and to stay back on the Edit panel itself?

Thanks.

Instead of returning script fragment try to add validation error to the collection:

protected void AlertAndClose()
{
    base.AddErrorValidator("Sign Post and Hide Sign Post Values should not be the same.");
}

Thanks Valdis.

Your suggestion is working fine for me.

Thanks again.