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Write the exception information to the event log (C#)

File: Default.aspx <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="ErrorTestLog" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Untitled Page</title> </head> <body>     <form id="form1" runat="server">     <div>         <asp:Label ID="Label1" runat="server" Text="A:"></asp:Label>         <asp:TextBox ID="txtA" runat="server">5</asp:TextBox><br />         <asp:Label ID="Label2" runat="server" Text="B:"></asp:Label>         <asp:TextBox ID="txtB" runat="server">0</asp:TextBox><br />         <br />         <asp:Button ID="cmdCompute" runat="server" OnClick="cmdCompute_Click" Text="Divide A / B" /><br />         <br />         <asp:Label ID="lblResult" runat="server" Font-Bold="True" ForeColor="Red"></asp:Label></div>     </form> </body> </html> File: Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Drawing; using System.Diagnostics; public partial class ErrorTestLog : System.Web.UI.Page {     protected void cmdCompute_Click(object sender, EventArgs e)     {         try         {             decimal a, b, result;             a = Decimal.Parse(txtA.Text);             b = Decimal.Parse(txtB.Text);             result = a / b;             lblResult.Text = result.ToString();             lblResult.ForeColor = Color.Black;         }         catch (Exception err)         {             lblResult.Text = "<b>Message:</b> " + err.Message + "<br /><br />";             lblResult.Text += "<b>Source:</b> " + err.Source + "<br /><br />";             lblResult.Text += "<b>Stack Trace:</b> " + err.StackTrace;             lblResult.ForeColor = Color.Red;             EventLog log = new EventLog();             log.Source = "DivisionPage";             log.WriteEntry(err.Message, EventLogEntryType.Error);         }     } }