typed dataset

use of DataSet classes in C # The DataSet class is one of the most central members of the Ado.net, and it is the most frequently contacted class for developing database applications based on the. NET Platform programming language. Each dataset has a lot of datatables and relationships. Relationship should also be a kind of table, in particular, this table is on

Relation and DataSetrelation in DataSetRelation in DataSet DataSet is an important data access model in ADO. Net. A major advantage is that the relationship between multiple tables can be recorded. It is a bit similar to the foreign key of the database. Similar relationships can also be defined in DataSet. DataSet has

In ASP. NET, Json data is converted to ADO. NET DataSet object, jsonado.net There are many methods to convert Json data to ADO. NET DataSet. Newtonsoft. Json also provides DataSet Converter to convert Json data. However, in some cases, DataSet Converter does not work and may not meet the project's needs. This article i

Namespace test {using system. diagnostics; using system. web; using system. web. services; using system. data; using system; using microshaoft; [WebService (namespace = "http://www.microshaoft.com/")] public class service1class: WebService {[webmethod] Public String helloworld () {return "Hello World";} [webmethod] public byte [] getdata () {dataset DS = new dataset (); // populate

Dataset writexml allows you to write dataset content in XML format. A common task that follows is to convert the XML into another format using XSL Transformation (XSLT. However, by synchronizing dataset with xmldatadocument, you can apply an XSLT style table to the content of dataset, instead of using writexml to write

Http://hi.baidu.com/smalltube/blog/item/58640e771d5caf1fb151b958.html According to some information on the Internet, I wrote two classes to convert dataset and excel. The Excel COM control must be introduced before use .. Using system;Using system. Data;Using Excel; Namespace datasetandexcel{/// /// Convert a dataset to an Excel Workbook/// Public class dataset2workbook{ Private

code example:string sqlcoon = "server=.;D atabase=abc;uid=sa;pwd=123456 ";SqlConnection coon = new SqlConnection (sqlcoon);String sql = "SELECT * from Smartercloud_unit";SqlCommand cmd = new SqlCommand (sql,coon);Coon. Open ();//SqlDataReader//sqldatareader reader = cmd. ExecuteReader (commandbehavior.closeconnection);//datatable table = new DataTable ();//table. Load (reader);//messagebox.show (table. Rows.Count.ToString ());//this.datagridview1.datasource = table;SqlDataAdapterSqlDataAdapter a

list box. Dim Drorder as DataRow For each drorder in Draorders LBORDERS.ITEMS.ADD (Drorder ("OrderID")) Next C# Clears the list of orders when the selected customer is changed. LbOrders.Items.Clear (); Rtbdetails.text = ""; Add the order IDs for each related order to the list box. foreach (DataRow drorder in draorders) { LBORDERS.ITEMS.ADD (drorder["OrderID"]); } Save the project. Run the application. List box displays the list of orders. Select another customer in the combo box and the

(http://www.jb51.net/article/54418.htm)This article mainly introduces the method of C # data acquisition from a DataTable, related to C # operation of the DataTable, the need for friends can refer to the followingThis article describes in an instance the three implementation methods for updating a database using the DataSet DataTable, including the CommandBuilder method, DataAdapter updating the data source, and updating using SQL statements. Share it

I often hear this question: "should I use the DataReader class or the DataSet class in ASP. NET Web applications ?" I often see this misunderstanding in many articles and newsgroups, that is, the DataReader (abbreviation of SqlDataReader or OleDbDataReader) is better than DataSet. Sometimes I see the opposite. In fact, Microsoft has created these two data access classes because they are all what we need. Ea

Dataset and datatable Each dataset is a collection of one or more able objects (datatable is equivalent to a table in the database). These objects are composed of datarow, datacolumn, and columnname) item, and the relationship (Relations) related to the data in the datatable object and the data display sorting (dataview) information. Difference between dataset a

[Size = x-large] using system; Using system. Collections. Generic; Using system. text; Using system. Data; Using system. Windows. forms; Using system. reflection; Namespace DMS{/// /// C # Excel operations/// Class exceloperate{// Method 1 // Public bool datasettoexcel (Dataset dataset, bool isshowexcle)//{// Datatable = dataset. Tables [0];// Int rownumber = d

HTML5 Description of custom attributesThe "28 HTML5 features, tricks and techniques you must know" article in the previous translation of the custom legal attributes in HTML5 data- has been introduced, that is, in HTML5 we can use data- the prefix to set the custom properties we need to do some data storage, For example, we want to store the corresponding ID on a text button:TestThe data- prefix is called data属性 , which can be defined by a script, or the CSS property selector can be applied to s

1. Dataset ObjectL And sqldatareader Object comparisonSqldatareader is a fast and efficient structure for obtaining query results. It only supports Reading query results one way forward and the data is read-only. Dataset allows you to view query results cyclically and cyclically, and supports sorting, searching, and caching and modifying data. L DataSet object me

LINQ to Dataset In addition. net integration, through ADO. net to obtain data, and then query the data through LINQ, so as to implement complex query of the Data. To be understood as querying the data saved in dataset through LINQ, generally, den provides the following steps: 1.Obtain the dataset or datatable Data Source, LINQ to

I often hear people ask this question: "Should I use a DataReader class or a DataSet class in a ASP.net Web application?" "I often see this misconception in many articles and newsgroup postings that DataReader (SqlDataReader or OleDbDataReader abbreviations) are better than datasets. Sometimes I also see the opposite story. In fact, Microsoft created the two data access classes because they were all we needed. Each class has its advantages and disadva

1. dataview indicates the datatable. The records in the able table have no sequence, but the display can be in different order (dataview ), But it is still the same table, so a datatable can have multiple dataviews. By default, the datatable is accessed. Defaultview. Dataset is a set of datatable, and there can be more than one datatable 2. dataview is a virtual view of a able. It is mainly used to display data. In fact, all data changes occur in t

Editor's note: Is DataReader or DataSet used? First, you need to know the similarities and differences between them and the applicable working environment. After learning about this information, you can easily solve the problem when to use it. The following describes how to differentiate data. I collected it online and used DataReader or DataSet. The answer below is clear. Use both DataReader and DataSetDat

. Net DataSet export to Excel,. netdatasetPublic void CreateExcel (DataSet ds, string typeid, stringFileName) {HttpResponse resp; resp = Page. response; resp. contentEncoding = System. text. encoding. getEncoding ("GB2312"); resp. appendHeader ("Content-Disposition", "attachment; filename =" + FileName); stringcolHeaders = "", ls_item = ""; int I = 0;// Define the table object and row object, and use

database. In Server Explorer, expand the Northwind data connection until you can see all the tables. Creating data Adapters and connections This step creates connections and data adapters that are used to connect and exchange data between applications and data sources. Creating data Adapters and connections Drag the Customers table from the Server Explorer (Server Explorer) onto the form. The connection and data adapters are displayed in the component tray. Select Connection (Connect) and set