This project uses Raspberry Pi with ultra-low-cost software radio (SDR) hardware to receive tracking information sent from an airborne S-mode transponder outside millions of miles. The Raspberry Pi is equipped with a smart 3.5-inch TFT display to provide a convenient overview of aircraft activities.
HardwareThe rtl2832u-based small SDR receiver (124-5461) is designed for DVB-T reception and is on the
Introduced:In the Web page, we often encounter the situation in. Select the province in the drop-down box first, and then the second drop-down box will automatically load the city in the province. This design greatly facilitates the user's search. So how does this work?1. Establish a database"Province" table"City" table2. Adding controls3, two drop-down boxes bind the data source separately protected void Page_Load (object sender, EventArgs e) {//Determines whether to enter the page for the
;}
Method is called:
1 2 3 4 5 P align= ' left ' >6 7 8 9 10
staticvoidmain (string[] args) { person person = new Person (1, "Flyelephant", "Beijing"); user User = Newuser (); user. Id =; user = convertobject (user, person); console.writeline ("Id:" + user . Id + "Name:" + user. Name + "role:" + user. Group); system.console.read (); NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;} NBSP;NBSP;NBSP;NBSP;NBSP;
2. I used to go back to SqlHelper when I wa
Commandbehavior. closeconnection is used to ensure that the connection is also disabled when datareader is disabled.
Public static sqldatareader (.....)
{Sqlcommand cmd = new sqlcommand ();Sqlconnection conn = new sqlconnection (connectionstring );
// We use a try/catch here because if the method throws an exception we want// Close the connection throw code, because no datareader will exist, hence// Commandbehaviour. closeconnection will not work Try{Preparecommand (CMD, Conn, null, struct
System.Configuration;Using firstmvc.models;//Note adding referencesNamespace Firstmvc.controllers{The first instance of the MVC schemaRecent exposure to MVC, see most tutorials TakeLinqtosql, here's an ADO way of writingAuthor:luckyhuDate:2012-03-30public class Membercontroller:controller{//GET:/menber/Define some global variablesString connstr = configurationmanager.connectionstrings["ConnectionString"]. ConnectionString;SqlConnection conn = null;SqlCommand cmd = null;SqlDataReader
Asp.net| Stored Procedures
Recently met some friends in csdn to ask the method of the stored procedure on the ASP.net, here will my experience summed up and the release of processing for your reference.
The basic idea is to get the parameters of the stored procedure, then collect the values based on the parameter table, and then call the stored procedure. However, the control ID required in the page must be consistent with the parameters of the stored procedure. And there are several ways to inv
LPC4350 Sgpio ExperimentationThe NXP lpc43xx microcontrollers has an interesting, programmable serial peripheral called the Sgpio (serial GPIO).It consists of a slew of counters and shift registers that can is configured to serialize and deserialize many channels of Data.Channels can grouped to create multi-bit parallel data streams.AN11210 Using Sgpio to emulate an SPI master interfaceAN11275 Sgpio on the lpc4300-emulating PWM via SgpioAN11343 Sgpio Camera module design using LPC4300AN11351 imp
ASP. NET -- Implement Dynamic Interaction between two drop-down boxes and asp.net drop-down boxes
Introduction:
We often encounter problems on webpages. First, select the province in the drop-down box. Then, the second drop-down box will automatically load the city in the province. This design greatly facilitates user search. How is this implemented?
1. Create a database
"Province" table
City table
2. Add controls
3. Bind data sources in the two drop-down boxes
Protected void Page_Load (o
To configure the database connection string in Webconfig, the code is as follows:
Copy Code code as follows:
Then get the connection string inside the Webform_1.aspx.cs to add the following reference;
Copy Code code as follows:
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
Code:
Copy Code code as follows:
SqlConnection con;
protected void Page_Load (object sender, EventArgs e)
{
Connectdb ();
}
private void Connectdb ()
{
string c
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