public string[,] OpenExcel(string filename)
{
using (ClosedXML.Excel.XLWorkbook workbook = new ClosedXML.Excel.XLWorkbook(filename))
{
ClosedXML.Excel.IXLWorksheet worksheet = workbook.Worksheet(1);
int rc = worksheet.RangeUsed().RowCount();
int cc = worksheet.RangeUsed().Row(1).CellCount();
string[,] buff = new string[rc, cc];
for (int i = 0; i < rc; i++)
{
ClosedXML.Excel.IXLRow row = worksheet.Row(i + 1);
for (int j = 0; j < cc; j++)
{
ClosedXML.Excel.IXLCell cell = row.Cell(j + 1);
string value = cell.GetValue <string>();
buff[i, j] = value;
}
}
return(buff);
}
}