C#

    ServiceController controller = new ServiceController("not existing service");
    try
    {
        if (controller.Status == ServiceControllerStatus.Running)
        {
            // do something
        }
    }
    catch (InvalidOperationException ex)
    {
        // come here when service name does not exist
    }
}

private void PlayList_CellClick(object sender, MouseEventArgs e)
    {
        if(e.Button == MouseButtons.Right)
        {
            Point loc = this.PointToScreen(new Point(e.X, e.Y));

            int index = PlayList.HitTest(e.X, e.Y).RowIndex;

            PlayListMenu.Show(loc.X, loc.Y);
        }
    }

BinaryWriter bw = new BinaryWriter(new FileStream(textbox1.Text, FileMode.Create,FileAccess.Write,FileShare.Write));
BinaryWriter bw1 = new BinaryWriter(new FileStream(textbox1.Text, FileMode.Open));

private void btSelectDirToSave_Click(object sender, EventArgs e)
{
    if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
    {
        txtboxSelectExcelDir.Text = folderBrowserDialog1.SelectedPath;
    }
}

string namefile;
namefile = txtboxSelectExcelDir.Text;

objExcel.ActiveWorkbook.SaveAs(namefile + "_Nom022.xls",Excel.XlFileFormat.xlWorkbookNormal,Type.Missing,Type.Missing,Type.Missing,
    Type.Missing,Excel.XlSaveAsAccessMode.xlNoChange,Type.Missing,Type.Missing,Type.Missing,Type.Missing);