C#读取EXCEL到内存

public class ExcelUtils
    {
        private static string strcon = "Server=48.12.1.28;initial catalog=NBSFJ_FF;User Id=nbsfj;Password=nbsfj@123;";
        public static DataSet ReadExcelToDS(string Path)
        {
            try
            {
                string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties='Excel 8.0;HDR=NO;IMEX=1';";
                OleDbConnection conn = new OleDbConnection(strConn);
                conn.Open();
                DataTable schemaTable = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
                if (schemaTable != null)
                {
                    string sheetName = schemaTable.Rows[][].ToString().Trim();
                    //第一张sheet的名称，这个索引为什么是[0][2]也是尝试出来的

                    if (sheetName != null && sheetName.Length > )
                    {
                        string strExcel = "select * from [" + sheetName + "]";
                        OleDbDataAdapter myAdp = new OleDbDataAdapter(strExcel, conn);
                        DataSet ds = new DataSet();
                        myAdp.Fill(ds);

                        DataTable dt = ds.Tables[];
                        if (dt.Rows.Count > )
                        {
                            for (int i = ; i < dt.Rows.Count; i++)
                            {
                                if (!string.IsNullOrEmpty(dt.Rows[i][].ToString()))
                                {
                                    string sql = "insert into FF_SysCode values('" + dt.Rows[i][].ToString().Trim() + "','" + dt.Rows[i][].ToString().Trim() + "','户籍所在地','" + dt.Rows[i][].ToString().Trim() + "',0,'" + i + "',1,null,null,null,null)";
                                    ExcelUtils eu = new ExcelUtils();
                                    eu.Exec(sql);
                                }
                            }
                        }
                    }
                } return null;

            }
            catch (Exception e)
            {
                //throw new WebAppException(e.Message);
            }
            return null;
        }
        public int Exec(string sql)
        {
            SqlConnection con = new SqlConnection(strcon);
            con.Open();
            SqlCommand com = con.CreateCommand();
            com.CommandText = sql;
            int i = com.ExecuteNonQuery();
            con.Close();
            return i;
        }

    }