Vb.Net Code for system shutdown,restart

Public Class frmShutdown
    Private Sub btnShutdown_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnShutdown.Click
        System.Diagnostics.Process.Start("shutdown", "-s -t 00")
        'This will make the computer Shutdown
    End Sub
    Private Sub btnRestart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRestart.Click
        System.Diagnostics.Process.Start("shutdown", "-r -t 00")
        'This will make the computer Restart
    End Sub
    Private Sub btnLogOff_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogOff.Click
        System.Diagnostics.Process.Start("shutdown", "-l -t 00")
        'This will make the computer Log Off
    End Sub
    Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
        End
        'This will make the program to terminate(end the program)
    End Sub
End Class

Project Expiry

private void Check_Expiry()
{
DateTime newDate = new DateTime();
TimeSpan RemainingDay = new TimeSpan();
DateTime TodayDate = DateTime.Today;
if (cnn.State == ConnectionState.Open)
{
cnn.Close();
}
try
{
string strCom = "Select ExpiryDate, FirstDay from Expiry where sr = 1";
 
cnn.ConnectionString = CnnStr;
cnn.Open();
OleDbCommand Comm = new OleDbCommand(strCom, cnn);
OleDbDataReader dr = Comm.ExecuteReader();
while (dr.Read())
{
if (dr[0] == DBNull.Value)
{
newDate = DateTime.Today;
Insert_Expiry_Date(newDate);
}
else if (Convert.ToDateTime(dr[1]) > DateTime.Today)
{
MessageBox.Show("Please correct your System Date.", "SMS");
Application.Exit();
}
else if (Convert.ToDateTime(dr[0]) < DateTime.Today)
{
MessageBox.Show("Please correct your System Date.", "SMS");
Application.Exit();
}
else
{
if (Convert.ToDateTime(dr[0]) == DateTime.Today)
{
MessageBox.Show("Your trail period is expired. Please purchase this Software.", "SMS");
Application.Exit();
}
else
{
newDate = Convert.ToDateTime(dr[0]);
RemainingDay = newDate.Subtract(TodayDate);

MessageBox.Show("You have " + RemainingDay.Days + " days Left.", "SMS");
}
}
}
dr.Dispose();
Comm.Dispose();
cnn.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "SMS", MessageBoxButtons.OK);
}
}
private void Insert_Expiry_Date(DateTime date)
{
try
{
if (cnn.State == ConnectionState.Open)
{
cnn.Close();
}
 
string strCom = "update Expiry set ExpiryDate = #" + date.AddDays(10) +
"#, FirstDay = #" + date + "# where sr = 1";

cnn.ConnectionString = CnnStr;
cnn.Open();
OleDbCommand Comm = new OleDbCommand(strCom, cnn);
Comm.ExecuteNonQuery();
MessageBox.Show("You have 10 days left to use this Software.", "SMS");
Comm.Dispose();
cnn.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "SMS", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}