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. DropDownList and ListBox are named ddlDep and lBoxEmp respectively. At the same time, set the AutoPostBack attribute in the DropDownList to TRUE (to make the reselect list have a response ).We need to write the corresponding code in formload and ddlDep_SelectedIndexChanged time. DdlDep_SelectedIndexChanged is the selected Space ddlDep. Double-click the time SelectedIndexChanged in properties-events on the right. Using System; using System. collections. generic; using System. web; using System

1. Basic Steps for ASP. NET database operations: Common Methods for ASP. NET data operations:A. ExecuteReader ()The returned result is a SqlDataReader object or OleDbDataReader object. Each return or operation guides a record to be stored in the server's memory.Compared with DataSet, quick access is usually used for query operations.B. ExecuteNonQuery ()C. ExecuteScalar () returns the Object type. If SELECT is executed, the returned result is the first column in the first row after the query.Re

regardless of whether an exception occurs, thus saving computer resources.3. Include the SqlConnection object in the using block, so that the program will automatically call the Dispose () method to release the system resources occupied by the SqlConnection object. You do not need to use the Close () method of the SqlConnection object.3. Specify the min pool size to indicate the minimum number of connections allowed by the connection pool (0 by default ). The following code specifies that the m

(SqlConnection conn = New SqlConnection (connStr) {// create an SQL query statement string SQL = "select MUserPwd from MovieAccount where MUserName = '" + txtName. text + "'"; // create SqlCommand execution command using (SqlCommand cmd = new SqlCommand (SQL, conn) {// open the database connection conn. open (); // use SqlDataReader to read the database using (SqlDataReader sdr = cmd. executeReader () {// SqlDataReader reads if (

clock resources for FPGA internal logical resources IO Local clock network that provides high performance and low jitter clock resources for selectiio logical resources Bufgmux can be reused between two global clock resources. It can also be used as a normal bufg clock buffer. This buffer can only directly drive global clock cabling resources and only drive clock input; of course, the clock input of the FPGA internal logic trigger can also come from those common wiring resources, but those co

public class PageUtil{ // Methods public static DataView GetListForPage(int index, int pagesize, string tabname, string key, string condition, string sortindex, ref int count) { int rscount = 0; StringBuilder strSql = new StringBuilder(); OracleDataReader sdr = null; if (condition.Length > 0) { condition = " and " + condition; } strSql.Append("select count(*) from " + tabname + " whe

int update (String sql){Close ();Open ();SqlCommand sc = new SqlCommand ();Sc.commandtext = SQL;Sc.commandtype = CommandType.Text;Sc. Connection = conn;int x = SC. ExecuteNonQuery ();Close ();return x;}Traversing data in a tablePublic SqlDataReader Sdread (String sql){Close ();SqlDataReader SDR;Open ();SqlCommand cmd = new SqlCommand ();Cmd. Connection = conn;Cmd.commandtext = SQL;Cmd.commandtype = CommandType.Text;

=yes;imex=1; '"; stringconnstr2007 ="Provider=microsoft.ace.oledb.12.0;data source="+ Server.MapPath (FileName) +"; Extended properties=\ "Excel 12.0; Hdr=yes\ ""; OleDbConnection Conn; if(Fileextension.tolower () = =". xls") {Conn=NewOleDbConnection (connstr2003); } Else{conn=NewOleDbConnection (connstr2007); } conn. Open (); stringsql ="select * FROM [sheet1$]"; OleDbCommand cmd=NewOleDbCommand (SQL, conn); DataTable DT=NewDataTable (); OleDbData

1.ASP. NET Operations Database: Asp. NET data manipulation methods commonly used: A. ExecuteReader () Returns a SqlDataReader object or OleDbDataReader object, with each return or operation directing a record to be saved in the server's memory. In the case of a dataset, the specific, faster access capability is often used for query operations. B.executenonquery () C.executescalar () returns the object type. If you are executing a SELECT, the result is the first row after the query, the first co

SqlParameter ("@PassWord ", Userinfo.password)}; SUSSU statement String sql = @ "SELECT * FROM [User_info] WHERE userid= @UserID and PassWord = @PassWord"; Put the parameter into the statement DataTable table = sqlhelper.executequery (sql, Sqlparams, commandtype.text); Returns the return table value; SQLHelper public class SQLHelper { private SqlConnection conn = null; Private SqlCommand cmd = null; Private S

SqlConnection is done on the premise of shutting down the SqlDataReader, or it is necessary to manually close the SqlDataReader. and return to the SqlDataReader, and close it again, how to do? Some netizens put forward: before return reader, first close reader, that is, reader. Close (); In fact, this is not possible, will report the same error as before, before reading the data, has been closed. CommandBehavior.CloseConnection is used to close the database connection, which is for sure, but

Tags: WinForm style class blog code httpIn c#2010, how do you save and access the connection string for the database?To add the App. Config file under WinForm, add the Web. config file under ASP.1. After opening the configuration file, add the relevant code as follows:"1.0" encoding="utf-8"?>"myconn" connectionstring="Data source=.;i Nitial Catalog=northwind; Persist Security info=true; User Id=sa; password="/> 2. Add a using System.Configuration, and right-click on the item "Add Reference"

Main (string[] args) { Establish a connection SqlConnection con = new SqlConnection (conn_string); Try { The test uses the CommandBehavior.CloseConnection method Console.WriteLine ("The test used CommandBehavior. Method of CloseConnection: "); SqlDataReader SDR = Getreader_closeconnection (con); while (SDR. Read ()) {} Sdr. Close (); Console.WriteLine ("Connecti

JMX Monitoring of application systems is very concise and convenient, but Tomcat does not set up to start JMX After research, you can change Tomcat's startup file to be Tomcat support JMX Find Tomcat_home/bin/catalina.bat Open with Notepad to find such a line "if not exist"%catalina_home%/bin/tomcat-juli.jar "goto Nojuli" Then insert the following code below this line If "%1" "= =" "Start" set java_opts=%java_opts%-dcom.sun.management.jmxremote.port=109