try
using (ExcelPackage package = new ExcelPackage())
{
ExcelWorksheet ws = package.Workbook.Worksheets.Add("Your Sheet Name");
int rowNumber = 1;
foreach (DataTable dt in ds.Tables)
{
ws.Cells["A" + rowNumber].LoadFromDataTable(dt, true);
rowNumber += dt.Rows.Count + 2;
}
package.SaveAs(new FileInfo(@"D:\Projects\CPTemp\CPTemp\TextFile.xlsx"));
}