读取Excel 2010文件 - C＃中的单元格

UPDATE 2

string connectionString = String.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 8.0;HDR=YES;IMEX=1;""", EXCELFILENAME);

            string testCaseName = "test_case_2";

            string query = String.Format("SELECT * from [{0}$] WHERE columns={1}", workbookName, testCaseName);

            OleDbDataAdapter dataAdapter = new OleDbDataAdapter(query, connectionString);

            DataSet dataSet = new DataSet();
            dataAdapter.Fill(dataSet); //<<ERROR 

        DataTable myTable = dataSet.Tables[0]; 
string connectionString = String.For