private void button4_Click(object sender, EventArgs e)
{
rMegrendeles rMegr = new rMegrendeles();
rMegr.SetParameterValue("ID",textBox1.Text);
rMegr.SetDatabaseLogon("sa", "x");
rMegr.PrintOptions.PrinterName = DEFS.getdefaultprinter();
crystalReportViewer1.ReportSource = rMegr;
}