DevExpress export GridView to Excel

To know various export methods of XtraGrid, go through Export Methods and Settings

Use GridControl.ExportToXls(String) Method

Example code snippet:

private void mnuExportTable_ItemClick_1(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
    using (SaveFileDialog saveDialog = new SaveFileDialog())
    {
        saveDialog.Filter = "Excel (2003)(.xls)|*.xls|Excel (2010) (.xlsx)|*.xlsx |RichText File (.rtf)|*.rtf |Pdf File (.pdf)|*.pdf |Html File (.html)|*.html";
        if (saveDialog.ShowDialog() != DialogResult.Cancel)
        {
            string exportFilePath = saveDialog.FileName;
            string fileExtenstion = new FileInfo(exportFilePath).Extension;
            
            switch (fileExtenstion)
            {
                case ".xls":
                    gridControl.ExportToXls(exportFilePath);
                    break;
                case ".xlsx":
                    gridControl.ExportToXlsx(exportFilePath);
                    break;
                case ".rtf":
                    gridControl.ExportToRtf(exportFilePath);
                    break;
                case ".pdf":
                    gridControl.ExportToPdf(exportFilePath);
                    break;
                case ".html":
                    gridControl.ExportToHtml(exportFilePath);
                    break;
                case ".mht":
                    gridControl.ExportToMht(exportFilePath);
                    break;
                default:
                    break;
            }

            if (File.Exists(exportFilePath))
            {
               try
               {
                   //Try to open the file and let windows decide how to open it.
                   System.Diagnostics.Process.Start(exportFilePath);
                }
                catch
                {
                    String msg = "The file could not be opened." + Environment.NewLine + Environment.NewLine + "Path: " + exportFilePath;
                    MessageBox.Show(msg, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
             }
             else
             {
                 String msg = "The file could not be saved." + Environment.NewLine + Environment.NewLine + "Path: " + exportFilePath;
                 MessageBox.Show(msg, "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
        }
    }
}

Reference:
Exporting Several XtraGrid Controls to a Single Excel File