alert box from asp.net 3.5 Code-Behind

Question

protected void ddlLanguage_SelectedIndexChanged(object sender, EventArgs e)
{           
    if (ddlLanguage.SelectedValue=="es-ES")
    {
        Page page = HttpContext.Current.CurrentHandler as Page;

        page.ClientScript.RegisterStartupScript(typeof(Page), "Script", "<script language='javascript'>alert('All content may not be in Spanish. Do you want to continue...');</script>");            
    }
}

All I want to do is display a simple alert box but all in vain...nothing pops-up. need some ayudar.

Answer 1

You need to verify if the startup script is not registered already. Check out this post.

Also you can build your custom MessageBox in ASP.NET. Check out this one .

Answer 2

You can also achieve in this way

protected void ddlLanguage_SelectedIndexChanged(object sender, EventArgs e)
{           
  if (ddlLanguage.SelectedValue=="es-ES")
   {         
      Response.Write("<script>alert('All content may not be in Spanish. Do you want to continue...');</script>");            
   }
}

Answer 3

ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "showalert","Alert Message", true);

This works for me without Postback try this