Accessing Excle file using OLEDB

public object ImportDateCreate()
        {
            // TODO:  添加 DJPlanExpImpFactory.Import 实现
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.InitialDirectory = "C:\\";
            openFileDialog1.FileName    = "未命名";
            openFileDialog1.Filter        = "Excel 文件|*.xls";
            openFileDialog1.Title        = "由Excel文件导入";
            System.Windows.Forms.DialogResult dialogResult = openFileDialog1.ShowDialog();
            if(dialogResult != System.Windows.Forms.DialogResult.OK)
            {
                return null;
            }    
            string filePath = openFileDialog1.FileName;
            if(filePath.Length == 0)
                return null;
            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +
            "Data Source="+ filePath +";"+"Extended Properties=\"Excel 8.0;HDR=NO;IMEX=1;\""; 
            OleDbConnection conn = new OleDbConnection(strConn); 
            conn.Open(); 
            string strExcel = string.Empty; 
            DataTable schemaTable = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables,null); 
            int TC = schemaTable.Rows.Count;
            string[] tableName = new string[TC];
            for(int m = 0 ;m < TC;m++)
            {
                string temp = schemaTable.Rows[m][2].ToString().Trim();
                //                temp = temp.Remove( temp.Length - , 1);
                tableName[m] = temp.Substring(0,(temp.Length));
            }
            OleDbDataAdapter myCommand = null; 
            DataSet ds = null;  
            //只有一个Sheet
            string sheetName = tableName[0];
            strExcel="select * from [" + sheetName + "]"; 
            myCommand = new OleDbDataAdapter(strExcel, strConn); 
            ds = new DataSet(); 
            DataSet result = new DataSet();
            myCommand.Fill(ds,"table1"); 
            myCommand.Fill(result, 0, ds.Tables[0].Rows.Count + 1, "table1");
            conn.Close();
            ds = new DataSet();
            DataTable table1 = new DataTable("table1");
            for(int i = 0;i < result.Tables[0].Columns.Count;i++)
                table1.Columns.Add(result.Tables[0].Rows[0][i].ToString(), typeof(string));
            for(int i = 1;i < result.Tables[0].Rows.Count;i++)
            {
                DataRow dr = table1.NewRow();
                for(int j = 0;j < result.Tables[0].Columns.Count;j++)
                {
                    dr[j] = result.Tables[0].Rows[i][j].ToString();
                }
                table1.Rows.Add(dr);
            }
            ds.Tables.Add(table1);
            return new object[]{ds, filePath}; 
        }