导出excel文件
	private void ExportToEx(String filename, string ext, BaseView exportView)
        {
            Cursor currentCursor = Cursor.Current;
            Cursor.Current = Cursors.WaitCursor;
            if (ext == "xls") exportView.ExportToXls(filename);
            if (ext == "xlsx") exportView.ExportToXlsx(filename);
            Cursor.Current = currentCursor;
        }
	private void OpenFile(string fileName)
    {
            if (XtraMessageBox.Show("Do you want to open this file?", "Export To...", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                try
                {
                    System.Diagnostics.Process process = new System.Diagnostics.Process();
                    process.StartInfo.FileName = fileName;
                    process.StartInfo.Verb = "Open";
                    process.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Normal;
                    process.Start();
                }
                catch
                {
                    DevExpress.XtraEditors.XtraMessageBox.Show(this, "Cannot find an application on your system suitable for openning the file with exported data.", Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
            progressBarControl.Position = 0;//进度条位置
    }


	ExportToEx(fileName, "xlsx", gridView); //将gridview中的数据导出excel
    OpenFile(fileName);