Use the Cursor property. that's all.
if (cmb_Status.Text == "Occupied")
{
OleDbDataAdapter adapter = new OleDbDataAdapter("select * from tbl_Bed where Status='Occupied'", con);
DataSet dss = new DataSet();
adapter.Fill(dss, "tbl_Bed");
if (dss.Tables["tbl_Bed"].Rows.Count > 0)
{
this.Cursor = Cursors.WaitCursor;
JeevanDeep.Report.ReportBedStatus bed = new JeevanDeep.Report.ReportBedStatus();
bed.SetDataSource(dss);
crystalReportViewer1.ReportSource = bed;
crystalReportViewer1.Zoom(50);
this.Cursor = Cursors.Default;
}
}