private void xuat_excel()
{
gridControl1.DataSource = m_grc.DataSource;
XlsExportOptions opt = new XlsExportOptions();
opt.SheetName = "NHAP_LIEU";
opt.TextExportMode = TextExportMode.Value;
string path = WinFormControls.saveFileDialog("DANH_SACH_NHAN_VIEN");
if (!String.IsNullOrEmpty(path))
{
gridView1.ExportToXls(path, opt);
var excel = new Microsoft.Office.Interop.Excel.Application();
excel.Visible = true;
Microsoft.Office.Interop.Excel.Workbooks books = excel.Workbooks;
Microsoft.Office.Interop.Excel.Workbook openexcel = books.Open(path);
}
}