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Whenever pages are loaded that contain web parts, SharePoint uses a single thread to load the page and process the web parts. This means that the time to load a page is increased as the sum of all the data-retrieval processes increase. If you build web parts that require a lot of processing like filling a tree control with sites this delay could become unacceptable. One way to mitigate this problem is to build your web parts so that they perform all data-retrieval operations on a separate thread. This type of asynchronous data retrieval is supported directly in the web part framework through the GetRequiresData and GetData methods. The GetRequiresData method is called during the web part life cycle, and determines whether or not asynchronous data retrieval will be implemented. Normally, this method returns False, which means that none of the standard web parts implement asynchronous data retrieval. You may, however, override this method and return True, which will signal your intention to use asynchronous data retrieval. The following code shows how this is done: public override bool GetRequiresData() { return true; } If the GetRequiresData method returns True, then the web part framework will call the GetData method. The GetData method is used to register a callback method, which ultimately will perform the data retrieval on a different thread. Therefore, you must first define a callback method that conforms to the type System.Threading.WaitCallback. The function signature for this type has no return value and takes a single argument of type object. The argument is used to pass any data you want to the callback method. The following code shows an example callback method to build a simple list of subsites. Note how the object data type is cast to the correct data type before it is used for retrieval. qr code generator in asp.net c# QR Code generation in ASP . NET MVC - Stack Overflow param> /// <returns></returns> public static MvcHtmlString QRCode (thisHtmlHelper htmlHelper, string data, int size = 80, int margin = 4, ... asp.net mvc qr code How To Generate QR Code Using ASP . NET - C# Corner 24 Nov 2018 ... This blog will demonstrate how to generate QR code using ASP . NET . Create an empty web project in the Visual Studio version of your choice. Add Web Form, right-click on the project, select Add New Item, choose web form, give it a name and click on Add. Add script and styles in web form head section. Using the interface javax.microedition.io.HttpConnection is probably the easiest way to use the MIDP API to communicate with a server. Listing 6-1 is a code segment that will create an instance of HttpConnection and use it to send a message to a server and read a response. Listing 6-1. Creating an Instance of HttpConnection /** * Makes a connection to the server and reads the data. */ public void run() { // you sync on the class because you don't want multiple // instances simultaneously attempting to download ContentConnection connection = null; DataInputStream dis = null; DataOutputStream dos = null; byte dataToSend = 3; try { // the method Connector.open() uses the URL argument // to decide what protocol to use (and hence what type // of Connection interface to return) in addition to // using the URL to determine the address of the // program to contact. connection = (ContentConnection)Connector.open( "http://frog-parrot.net:8080/servlet/ExampleServlet"); ((HttpConnection)connection).setRequestMethod(HttpConnection.POST); dos = connection.openDataOutputStream(); dos.write(dataToSend); // flush sends the message dos.flush(); // some implementations give errors if you open the data input stream // without first reading the response code: int responseCode = ((HttpConnection)connection).getResponseCode(); dis = connection.openDataInputStream(); byte received = dis.readByte(); } catch(Exception e) { // normally you would add some code here to send // the user an error message. vb net code 128 barcode generator,the compiler failed with error code 128 asp.net,asp.net qr code,microsoft excel code 128 font,free upc barcode generator excel,upc-a word font asp.net generate qr code Dynamically Generating QR Codes In C# - CodeGuru 10 Jul 2018 ... Become more proficient with the functionalities of the QR (Quick Response) Codelibrary that works with ASP . NET MVC applications. asp.net qr code ASP . Net MVC: Dynamically generate and display QR Code Image 4 Dec 2017 ... Here Mudassar Ahmed Khan has explained with an example, how to dynamically generate and display QR Code Image in ASP . Net MVC Razor.The QR Code Image will be dynamically generated in ASP . Net MVC Razor using the QRCoder library which is an Open Source Library QR code generator. public void buildTree(object data) { //get child webs SPWeb web = (SPWeb)data; SPWebCollection webs = web.Webs; foreach(SPWeb subweb in webs) { tree += "<p>" + subweb.Title + "</p>"; } } Registering the callback method is accomplished using the RegisterWorkItemCallback method. This method is called from the GetData method, where the arguments are created and passed to the callback method. The following code shows an example using the callback method I showed earlier: public override void GetData() { SPSite site = SPControl.GetContextSite(Context); SPWeb web = site.OpenWeb(); tree = "<p>" + web.Title + "</p>"; RegisterWorkItemCallback(new WaitCallback(buildTree),web); } When callback methods are used to retrieve data, the web part framework will track their work and wait for them to complete before trying to render the web part. The timeout for asynchronous data retrieval is controlled by the WebPartWorkItem element in the web.config file and is set to 7 seconds by default. If an asynchronous data-retrieval operation takes longer than this time, the RenderWorkItemTimeout method is called. Using this method, you can create a simple HTML message to indicate that the web part has timed out. The following code shows an example: protected override void RenderWorkItemTimeout(HtmlTextWriter writer) { writer.Write("<p>Web part timed out</p>"); } asp.net mvc generate qr code QR Code generation in ASP . NET MVC - Stack Overflow So, on your page (assuming ASPX view engine) use something like this: ... publicstatic MvcHtmlString QRCode (this HtmlHelper htmlHelper, string .... http://www.esponce.com/api/v3/ generate ?content=Meagre+human+needs ... asp.net qr code generator QR Code generation in ASP . NET MVC - Stack Overflow I wrote a basic HTML helper method to emit the correct <img> tag to takeadvantage of Google's API. So, on your page (assuming ASPX view ... In addition to texting Google, you can also call them. If you dial GOOG 411 (1-800-4664411) from any phone, you can get local search results. Use this to find a nearby business or landmarks. Once you have your results, you can say Text it, and Google will send you a text message with the address, or Map it, and you ll receive a text with a link to map directions. This is handy during cold weather when you don t want to get your hands out to dial or enter map locations. } finally { // even if there is a communications error, you need // to close the connection and the streams: try { if(dis != null) { disclose(); } if(dos != null) { dosclose(); } if(connection != null) { connectionclose(); } } catch(Exception e) { // normally you would add some code here to send // the user an error message } } } Several points in Listing 6-1 require some further explanation First, it wasn t an accident that I called the method run() as if the previous code were from a subclass of Thread Since reading from a socket may cause the current thread to block, it s a good idea to spawn a new thread for communications rather than using the main thread This is good practice for essentially all Java networking code it should be running on a dedicated thread. asp.net qr code generator Create or Generate QR Code in Asp . Net using C# , VB.NET - ASP ... 16 Apr 2017 ... 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