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ASP.Net » Development » Event Log 
Write to Event log in code behind (C#)

<%@ Page language="c#" src="ErrorTestLog.aspx.cs" AutoEventWireup="false" Inherits="ErrorTestLog" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:Label id="Label2" style="Z-INDEX: 106; LEFT: 144px; POSITION: absolute; TOP: 32px" runat="server" Font-Size="Smaller" Font-Names="Verdana" Width="16px" Height="16px">B:</asp:Label>
      <asp:TextBox id="txtA" style="Z-INDEX: 101; LEFT: 32px; POSITION: absolute; TOP: 32px" runat="server" Font-Size="Smaller" Font-Names="Verdana" Width="97px" Height="20px"></asp:TextBox>
      <asp:TextBox id="txtB" style="Z-INDEX: 102; LEFT: 160px; POSITION: absolute; TOP: 32px" runat="server" Font-Size="Smaller" Font-Names="Verdana" Width="97px" Height="20px"></asp:TextBox>
      <asp:Button id="cmdCompute" style="Z-INDEX: 103; LEFT: 280px; POSITION: absolute; TOP: 24px" runat="server" Font-Size="Smaller" Font-Names="Verdana" Width="152px" Height="32px" Text="Divide A / B"></asp:Button>
      <asp:Label id="Label1" style="Z-INDEX: 104; LEFT: 16px; POSITION: absolute; TOP: 32px" runat="server" Font-Size="Smaller" Font-Names="Verdana" Width="16px" Height="16px">A:</asp:Label>
      <asp:Label id="lblResult" style="Z-INDEX: 105; LEFT: 24px; POSITION: absolute; TOP: 80px" runat="server" Font-Size="Smaller" Font-Names="Verdana" Width="592px" Height="96px"></asp:Label>
      <asp:CheckBox id="chkLog" style="Z-INDEX: 107; LEFT: 456px; POSITION: absolute; TOP: 32px" runat="server" Font-Size="Smaller" Font-Names="Verdana" Width="240px" Height="24px" Text="Log errors to ProseTech log"></asp:CheckBox>
    </form>
  </body>
</HTML>


<%--
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Diagnostics;

  public class ErrorTestLog : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.Label Label2;
    protected System.Web.UI.WebControls.TextBox txtA;
    protected System.Web.UI.WebControls.TextBox txtB;
    protected System.Web.UI.WebControls.Button cmdCompute;
    protected System.Web.UI.WebControls.Label Label1;
    protected System.Web.UI.WebControls.Label lblResult;
    protected System.Web.UI.WebControls.CheckBox chkLog;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
      // Put user code to initialize the page here
    }

    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.cmdCompute.Click += new System.EventHandler(this.cmdCompute_Click);
      this.Load += new System.EventHandler(this.Page_Load);

    }
    #endregion

    private void cmdCompute_Click(object sender, System.EventArgs e)
    {
      try
      {
        decimal a, b, result;
        a = Decimal.Parse(txtA.Text);
        b = Decimal.Parse(txtB.Text);
        result = a / b;
        lblResult.Text = result.ToString();
      }
      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;

        // Write the information to the event log.
        EventLog log;
        if (chkLog.Checked == true)
        {
          log = new EventLog("ProseTech");
        }
        else
        {
          log = new EventLog();
        }
            
        log.Source = "ErrorTestLog_Page";
        log.WriteEntry(err.Message, EventLogEntryType.Error);
      }

    }
  }


--%>
           
       
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1. Get Event Entry from Event log (C#)
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