C#如何读取Excel

public DataSet ImportFromExcel(string filePath)
{
DataSet ds = new DataSet();
string connString = "Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = " + filePath + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";
DataTable table = OleDbHelper.GetExcelTables(connString);
if(table == null || table.Rows.Count <= 0)
{
return null;
}

foreach(DataRow dr in table.Rows)
{
string cmdText = "select * from [" + dr["TABLE_NAME"].ToString() + "]";
DataTable dt = OleDbHelper.FillDataTable(connString, cmdText);
dt.TableName = dr["TABLE_NAME"].ToString();
ds.Tables.Add(dt);
}

return ds;
}