Event Viewer read, write and clear in C#
Event Viewer read, write and clear in C#
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//Event Viewer read, write and clear in C#
using System;
using System.Data;
using System.Diagnostics;
using System.Windows.Forms;
namespace EventViewer
{
public partial class EventViewer : Form
{
public EventViewer()
{
InitializeComponent();
}
///
/// Read the Logs from Event Viewer - Application
///
public void ReadLogs()
{
//logType can be Application, Security, System or any other Custom Log.
string logType = "Application";
DataTable dtable = new DataTable("EventViewer");
DataColumn column;
DataRow row;
int i=0;
int LastLogToShow = 0;
// Create new DataColumn, set DataType,
// ColumnName and add to DataTable.
column = new DataColumn();
column.DataType = System.Type.GetType("System.String");
column.ColumnName = "InstanceID";
column.ReadOnly = true;
// Add the Column to the DataColumnCollection.
dtable.Columns.Add(column);
// Create new DataColumn, set DataType,
// ColumnName and add to DataTable.
column = new DataColumn();
column.DataType = System.Type.GetType("System.String");
column.ColumnName = "Source";
column.ReadOnly = true;
// Add the Column to the DataColumnCollection.
dtable.Columns.Add(column);
// Create new DataColumn, set DataType,
// ColumnName and add to DataTable.
column = new DataColumn();
column.DataType = System.Type.GetType("System.String");
column.ColumnName = "EntryType";
column.ReadOnly = true;
// Add the Column to the DataColumnCollection.
dtable.Columns.Add(column);
// Create new DataColumn, set DataType,
// ColumnName and add to DataTable.
column = new DataColumn();
column.DataType = System.Type.GetType("System.DateTime");
column.ColumnName = "Date";
column.ReadOnly = true;
// Add the Column to the DataColumnCollection.
dtable.Columns.Add(column);
// Create new DataColumn, set DataType,
// ColumnName and add to DataTable.
column = new DataColumn();
column.DataType = System.Type.GetType("System.String");
column.ColumnName = "Message";
column.ReadOnly = true;
// Add the Column to the DataColumnCollection.
dtable.Columns.Add(column);
try
{
EventLog ev = new EventLog(logType, System.Environment.MachineName);
LastLogToShow = ev.Entries.Count;
if (LastLogToShow <= 0)
{
dgvShow.DataSource = null;
MessageBox.Show("No log in the Event Viewer");
return;
}
for (i = ev.Entries.Count - 1 ; i > 0; i--)
{
EventLogEntry CurrentEntry = ev.Entries[i];
row = dtable.NewRow();
row["InstanceID"] = CurrentEntry.InstanceId;
row["EntryType"] = Convert.ToString(CurrentEntry.EntryType);
row["Date"] = Convert.ToDateTime(CurrentEntry.TimeGenerated);
row["Source"] = Convert.ToString(CurrentEntry.Source);
row["Message"] = Convert.ToString(CurrentEntry.Message);
dtable.Rows.Add(row);
}
ev.Close();
if (dtable.Rows.Count > 0)
{
dgvShow.DataSource = dtable;
}
}
catch (Exception ex)
{
throw ex;
}
}
///
/// EventView Click Event - Used to bind the Log message in the grid
///
///
///
private void btnEventViewer_Click(object sender, EventArgs e)
{
ReadLogs();
}
///
/// Write the log in the Eventviewer
///
void WriteLog()
{
try
{
//See if the source exists.
if (!(EventLog.SourceExists("MySystemSource", System.Environment.MachineName)))
EventLog.CreateEventSource("MySystemSource", "System", System.Environment.MachineName);
EventLog ev = new EventLog("System", System.Environment.MachineName, "MySystemSource");
/* Writing to system log, in the similar way you can write to other
* logs that you have appropriate permissions to write to
*/
ev.WriteEntry("Warning is written to system Log", EventLogEntryType.Warning, 10001);
MessageBox.Show("Warning is written to System Log");
ev.Close();
}
catch (Exception ex)
{
throw ex;
}
}
private void btnWrite_Click(object sender, EventArgs e)
{
WriteLog();
}
private void btnClear_Click(object sender, EventArgs e)
{
DialogResult result = MessageBox.Show("Are You sure want to Delete","Important Question",MessageBoxButtons.YesNo);
try
{
if (Convert.ToString(result) == "Yes")
{
//Create an EventLog instance and pass log name and MachineName where the log resides.
EventLog ev = new EventLog("Security", System.Environment.MachineName);
ev.Clear();
ev.Close();
}
}
catch (Exception ex)
{
throw ex;
}
}
}
}
http://royalarun.blogspot.in/2012/06/event-viewer-read-write-and-clear-in-c.html