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, the two methods do not close the connection, but they do not close the connection for the same reason. After preparing the two methods, call the two methods in the main method to test the methods. whether the sqldatareader object returned by the closeconnection method is automatically closed when it is closed, as shown in code 9-3. Code 9-3 Use commandbehavior. closeconnection: usecommandbehavior. CS Partial class usecommandbehavior{/// /// Test Method/// Static void main (string [] A

For your reference:Protected void Page_Load (object sender, EventArgs e){If (! IsPostBack){SqlConnection con = new SqlConnection ("server =; database = province; uid = sa; pwd = sa ;");Con. Open ();SqlCommand cmd = new SqlCommand ("select * from province", con );SqlDataReader sdr = cmd. ExecuteReader ();DropDownList1.DataSource = sdr;DropDownList1.DataTextField = "proname ";DropDownList1.DataValueField = "p

/*---------------------------------------------------------------------- * File name: * * Create Author: * * Create datetime: * * Description: *----------------------------------------------------------------------*/ Using system; Using system. Collections. Generic; Using system. text; Using system. Data; Using system. Data. sqlclient; Using dbutilitys; Namespace { Public class { Private Static readonly Public static /// /// Add record /// Public int insert _ { String executesqlstr =

/** // /// Province list box /// Private void displayprovince () { Sqldatareader SDR = dB. runprocgetreader ("select * From Province "); Ddlprovince. datasource = SDR; Ddlprovince. datatextfield = "proname "; Ddlprovince. datavaluefield = "proid "; Ddlprovince. databind (); SDR. Close (); } /** // /// City list /// Private void displaycity () { Sqldataadapter SD

database and develop database-based applications 5. Call other classes Using System; using System. collections. generic; using System. linq; using System. web; namespace web {// Specific application: The following describes how to use Jquery to implement the cascade drop-down box. You need to use a general handler to obtain the code of a general handler of the automobile type. Public class Handler1: IHttpHandler {public void ProcessRequest (HttpContext context) {context. response. contentTy

------------- Front-end gridview -------------------- ---------------- Backend CS file binding ------------------------- Protected void bindshoppingcart (){Database DB = new database ();Conn = dB. getconn ();String SQL = "select * From v_order ";Sqldatareader SDR = dB. runsql (SQL, Conn );Cartgrid. datasource = SDR;Cartgrid. databind ();SDR. Close ();DB. D

status is failbit Bool isbad = cin. Bad (); // whether it is in the badbit status Bool iseof = cin. EOF (); // whether the status is eofbit Set the CIN status Int state = 0; cin. setstate (State ); Clear the CIN status // set it to goodbit Cin. Clear (); Cin will become invalid in the following three cases: 1. Type Mismatch Initial status: "input buffer" is empty Double D = 0.0; Cin> D; // enter "SDR" on the keyboard and press Enter. Because the num

stream FileStream fs = new FileStream (path, FileMode. open, FileAccess. read); Byte [] imgbtye = new byte [fs. length]; fs. read (imgbtye, 0, Convert. toInt32 (fs. length); fs. close (); using (SqlConnection conn = new SqlConnection (sqlconn) {conn. open (); SqlCommand cmd = new SqlCommand (); cmd. connection = conn; cmd. commandText = "insert into T_TeacherImage (TeacherImage) values (@ imgfile)"; SqlParameter par = new SqlParameter ("@ imgfile", SqlDbType. image); par. value = imgbtye; cmd.

= conn. CreateCommand ()){Use of parametersCmd.commandtext = "SELECT * from admin where [email protected]";Cmd. Parameters.Add (New SqlParameter ("@rank", 2));Because the SqlDataReader implements the IDisposable interface, the interface that frees the object resource is IDisposableusing (SqlDataReader reader = cmd. ExecuteReader ()){The query results are placed in the database and are not placed in the client, and can later be processed with a datasetwhile (reader. Read ()){String name = (strin

(CAS), where the data is saved in the matrix. Trp:ras The pre-charge time, which is the time between disabling data row access and starting another row of data access. Tras: Activates the pre-charge delay, which is the time that the memory must wait before starting the next memory access. cmd: The command rate is the time between the storage chip activation and the first command sent to the memory. Sometimes, this value is not advertised. It is usually T1 (a clock speed) or T2 (2 clock sp

First, set allowpaging = "true" in the property interface gridview" 1 Protected Void Page_load ( Object Sender, eventargs E) 2 { 3 String Keyword = Request [ " Keyword " ]; 4 Sqlconnection con = DB. createconnection (); 5 Con. open (); 6 Dataset DS = New Dataset (); 7 Sqldataadapter SDR = New Sqldataadapter (); 8 SDR. selectcommand = New Sqlcommand

case, output the result in one line. Sample Input 231 2 341 2 3 3 Sample Output 1 4 AuthorWJMZBMR Source2014 Multi-University Training Contest 4 #include #include #include #include using namespace std;typedef long long int LL;const LL mod=(1e9+7);int n,a[1100];LL dl[1100][2100],sdl[1100][2100];LL dr[1100][2100],sdr[1100][2100];void init(){ memset(dl,0,sizeof(dl)); memset(sdl,0,sizeof(sdl)); memset(dr,0,sizeof(dr))

response message content to the client 3. Access to server-side file systems 4. Connect to the database and develop database- based applications5. Calling other classes Using System; Using System.Collections.Generic; Using System.Linq; Using System.Web; Namespace Web { //Detailed application:The following is the use of jquery to implement cascading drop-down effects. A generic handler is required to obtain the code of the general handler for the car type.public class Handler1

later.Public DataTable dt (){// This data control can only return those classes, such as sqldataadapter, dataset, and able. What else have you forgotten? Here we return a data table to the front.SqlConnection con = new SqlConnection (connstring );SqlDataAdapter sda = new SqlDataAdapter ();Sda. selectCommand = new SqlCommand ("SELECT * FROM [Categories] order by [CategoryID] DESC", con); // here we feel that it is difficult to write SQL statements, so I think of a good way, very simpleDataSet ds

The DropDownList and ListBox implement level two linkage function. They can also bind the information that is picked up from the background database. The function to be implemented here is to select "Province" in the DropDownList, and then let the listbox take the initiative to show the "city" under its province, this is called the two-level linkage function, which we see on the very many register page. Today we are going to use ASP to unravel its magical veil.First, set the foreground interface

. Accessing the server-side File system 4. Connect to the database and develop database- based applications5. Calling other classes Using System; Using System.Collections.Generic; Using System.Linq; Using System.Web; Namespace Web { //Specific application:The following is the code that uses jquery to achieve a generic handler for the type of car that is used in a cascading drop-down box effect.public class Handler1:ihttphandler {public void ProcessRequest (HttpContext

With ASP.net control to achieve departmental and employee linkage, the reference process is as followsEffect Chart: Default.aspx code: Default.aspx.cs Code: using System; Using System.Collections.Generic; Using System.Linq; Using System.Web; Using System.Web.UI; Using System.Web.UI.WebControls; Using System.Data.SqlClient; Public partial class _default:system.web.ui.page {protected void Page_Load (object sender, EventArgs e) {if (!th Is. IsPostBack) {SqlConnec

. // InitializeComponent (); Base. OnInit (e); } Designer supports the desired method-do not use The Code Editor modifies the contents of this method. private void InitializeComponent () { This. Firstpage.click + = new System.EventHandler (this. Firstpage_click); This. Prevpage.click + = new System.EventHandler (this. Prevpage_click); This. Nextpage.click + = new System.EventHandler (this. Nextpage_click); This. Lastpage.click + = new System.EventHandler (this. Lastpage_click); This. Newpagego

SqlConnection (sqlconn)) {Conn. Open (); SqlCommand cmd = new SqlCommand (); Cmd. Connection = conn; Cmd.commandtext = "Select Teacherimage from T_teacherimage where id= ' 1 '"; SqlDataReader SDR = cmd. ExecuteReader (); Sdr. Read (); MyData = (byte[]) sdr["Teacherimage"];

=NewSqlConnection (conn_string);Try{//the test uses the CommandBehavior.CloseConnection methodConsole.WriteLine ("the test uses CommandBehavior.methods of CloseConnection:");SqlDataReader SDR=getreader_closeconnection (con); while(SDR). Read ()) {}SDR. Close (); Console.WriteLine ("the connection status after reading is complete:"+con. State.tostring ());//testin