在C＃.net 4.0中使用XLS的主要问题

public static DataTable GetExcelData(string excelFilePath)
{
    OleDbConnection objConn = null;
    string oledbConnectionString = \"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=\" + excelFilePath + \";Extended Properties=Excel 10.0;\";
    objConn = new OleDbConnection(oledbConnectionString);

    if (objConn.State == ConnectionState.Closed)
    {
        objConn.Open();
    }
    var objCmdSelect = new OleDbCommand(\"Select * from [Sheet1$]\", objConn);
    var objAdapter = new OleDbDataAdapter();
    objAdapter.SelectCommand = objCmdSelect;
    var objDataset = new DataSet();
    objAdapter.Fill(objDataset, \"ExcelDataTable\");
    objConn.Close();
    return objDataset.Tables[0];
}