Ajax ASP.Net Tutorial

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<%@ Page Language="C#" %>
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    protected void btnDeleteAll_Click(object sender, EventArgs e)
    {
        if (FileHelper.DeleteAll() == true)
        {
            string script = @"alert('All Files Deleted Successfully!');";
            ScriptManager.RegisterStartupScript(this, this.GetType(), "filesDeleted", script, true);
        }
    }



    Show Alert UpdatePanel


    
    

            id="sm1"
        Runat="server" />
    
    
    UpdatePanel Time: <%= DateTime.Now.ToString("T") %>
    
            id="btnDeleteAll"
        Text="Delete All Files"
        OnClick="btnDeleteAll_Click"
        Runat="server" />