private DataSet importExcelFile(string fileName)
{
Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.Application();
System.Data.DataSet ds = new System.Data.DataSet();
Workbook wkBook = excelApp.Workbooks.Open(fileName, 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0);
ds.DataSetName = wkBook.Name;
foreach (Worksheet ws in wkBook.Worksheets)
{
ds.Merge(importExcelSheet(ws));
ds.AcceptChanges();
}
System.Windows.Forms.DataGridTableStyle tstyle = new System.Windows.Forms.DataGridTableStyle();
tstyle.AllowSorting = true;
tstyle.RowHeaderWidth = 0;
DG.TableStyles.Add(tstyle);
DG.NavigateBack();
DG.NavigateBack();
DG.DataSource = ds;
excelApp.Quit();
releaseObject(excelApp);
releaseObject(wkBook);
return(ds);
}