Thanks Jan for your reply.

I have solve it now myself.

below the code is working for me :

public class updatetext : ApplicationEventHandler { protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext) { ContentService.Published += ContentService_Publishing; }

    void ContentService_Publishing(IPublishingStrategy sender, PublishEventArgs<Umbraco.Core.Models.IContent> e)
    {
        foreach (var content in e.PublishedEntities)
        {
            var test = content.GetValue<int>("test");
            if (content.ContentType.Alias == "Product" && test == 0)
            {

                int count = 1;                   
                var contentService = ApplicationContext.Current.Services.ContentService;
                var student = contentService.GetById(content.Id);
                student.SetValue("test", count);
                student.SetValue("start", "first time published");
                contentService.SaveAndPublishWithStatus(student);
                count++;
              BasePage.Current.ClientScript.RegisterClientScriptBlock(this.GetType(), "refresh301URLTracker", "$(window).load(function(){UmbClientMgr.contentFrame('editContent.aspx?id=" + content.Id + "');})", true);

            }


        }
    }
}