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  • DataGridView live display of datatable using virtual mode

    - by Chris
    I have a DataGridView that will display records (log entries) from a database. The amount of records that can exist at a time is very large. I would like to use the virtual mode feature of the DataGridView to display a page of data, and to minimize the amount of data that has to be transferred across a network at a given time. Polling for data is out of the question. There will be several clients running at a time, all of which are on the same network and viewing the records. If they all poll for data, the network will run very slowly. The data is read-only to the user; they won't be able to edit any of it, just view it. I need to know when updates occur in the database, and I need to update the screen with those updates accordingly using virtual mode. If a page of data a user is viewing contains data that has change, he/she will see those updates on that page. If updates were made to data in the database, but not in the data the user is viewing, then not much really changes on the user screen (Maybe just the scroll bar if records were added or removed). My current approach is using SQL server change tracking with the sync framework. Each client has a local SQL Server CE instance and database file that is kept in sync with the main database server. I use the information from the synchronization event to see if any changes were made to the main database and were sync'ed to the client. I need to use the DataGridView virtual mode here because I can't have thousands of records loaded into the DataGridView at once, otherwise memory usage goes through the roof. The main challenge right now is knowing how to use virtual mode to provide a seamless experience to the user by allowing them to scroll up and down through the records, and also have records update on the fly without interfering with the user inappropriately. Has anybody dealt with this issue before, and if so, where I can see how they did it? I've gone through some of the MSDN documentation and examples on virtual mode. So far, I haven't found documentation and/or examples on their site that explains how to do what I am trying to accomplish.

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  • Android - How to Create Intent to open the activity that displays the "Accounts & Sync settings" scr

    - by bryan
    I have seen the below log message when navigating to the Account & sync settings screen but I am confused as to how to create an Intent to navigate there. INFO/ActivityManager(53): Starting activity: Intent { cmp=com.android.providers.subscribedfeeds/com.android.settings.ManageAccountsSettings } I dont seem to have access to the ManageAccountsSettings for development. I just wanted to create an Intent such as below, but I cant call out ManageAccountsSettings Intent i =new Intent(this,ManageAccountsSettings.class); //Then start the activity startActivity(intent);

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  • How to set background color of a View

    - by Peter vdL
    I'm trying to set the background color of a View (in this case a Button). I use this code: // set the background to green v.setBackgroundColor(0x0000FF00 ); v.invalidate(); It causes the Button to disappear from the screen. What am I doing wrong, and what is the correct way to change the background color on any View? Thanks.

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  • How to make Multi-Pane GUI in WPF or C#?

    - by xarzu
    I have seen this user interface in some screen shots of some RSS Readers. It is a multi-pane user interface. THere are three panels or "panes" to the window, in other words, the window is divided into three parts and the user is able to mouse over the division and click on the seperation bar and resize the section. How is this sort of GUI developed in C#?

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  • In an array of buttons, how can you tell which button was clicked?

    - by Michael Seltenreich
    If I have an array of buttons, how can I tell which button was clicked? example below var i=0 CreateButton = new function () { savebutton[i]=NewButton() i++ } every time a user runs the function a new button is generated. the first button is savebutton[0] the second is savebutton[1] and so on potentially infinity times. when later the user presses the button I want the screen to alert it's index number (or 'i'). is there any way to make this work in arrays?

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  • How do I add a css class to the TempData output?

    - by Pete
    The TempData output is plain text and putting a div around it will leave a formatted but empty div on the screen if there is no TempData. Is there a way to apply a class to it so that it only shows when the TempData item is set? Other than writing the div code into the TempData, which seems like a horrible idea.

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  • How to make Android Service run even when the device is not awake?

    - by Deema
    hi my application objective is to save location updates every ,let say, 20 minuets . I used service and it worked fine , but when i lock the screen or it is locked automatically the service stop running . when i unlock it , service runs again. highlight on my code: Service xxx onCreat(){ call timer(); } timer(){ code } How to make my code run all the time in all conditions?

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  • Are there any frameworks for data subscription and update?

    - by Timothy Pratley
    There is one server with multiple clients. The clients are viewing subsets of the servers entire data. If the data that a client is viewing changes, the client should be informed of the changes so that it displays the current data. Example: Two clients are viewing a list of users in an administration screen. One client adds a new user to the list and modifies the permissions of another user. The other client sees the changes propagated to their view.

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  • How to display a non-model, temporary pop-up message in Android?

    - by chefgon
    For an example of what I'm looking for, hit the Home button while you're composing a message in the Gmail app. A little message will pop up at the bottom of the screen for a moment that says "Message saved as Draft." I can't figure out how to display one of those messages myself, and I'm not sure what to call it so I can't do a search for it.

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  • JQuery: Floating share box like Mashable?

    - by Prashant
    I am looking for a jQuery plugin which can serve me the floating share box functionality just like mashable implement in their new design: http://mashable.com/2010/03/12/flickr-co-founders-startup-hunch-raises-10-million/. On the page above in the left side mashable has sharing options which stays on the screen when you scroll the page. I want to implement same kind of functionality in my application, using a jQuery plugin.

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  • Pretty Pixel-level Picture Painting, Programatically

    - by dreeves
    My mac laptop has 1,024,000 pixels. What's the simplest way to turn my display completely black and go nuts with writing little programs to twiddle pixels to my heart's delight? To make it more concrete, say I wanted to implement the Chaos Game to draw a Sierpinski triangle, at the pixel level, with nothing else on the screen. What are ways to do that?

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  • Providing unique layout for specific resolution in Android 2.3.3

    - by user1384991
    I need to use specific xml-layouts based on screen resolution, not size. So, the first design is used for resolution <= 480x800, and the second - for resolution = 480x800. How is it done ? update. Possible solution: Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay(); final int height = display.getHeight(); final int width = display.getWidth();

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  • How to copy image of a chart from Silverlight application to clipboard

    - by zidane
    I have Silverlight 3.0 applications with some custom graphic and some charts. I need to find a best way to transfer this graphic to PowerPoint presentation. I`we read that Silverlight 4.0 offers new Clipboard API, but there is only support for Unicode-text, not images. Is there a way to achieve this task without forcing user to manually print screen and than paste to other applicatons.

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  • How do I make it save in x-code?

    - by Nathan
    THIS IS USING X-CODE Okay, so I've put in all of the code in order for a page to be saved in a navigation app. I've also made the table refresh once you enter the main screen, but I don't see the page pop up until the second time I come back. How can I make it so it comes up the first time I come in?

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  • prevent IE Mobile from scaling web pages automatically

    - by Adam
    I have not been able to get IE mobile to stop automatically resizing my site design. I am using three stylesheets with media queries to display the site differently on different device screens. I've included the meta tag so it shows the mobile stylesheet on IE mobile but it keeps setting the viewport at 320X480 instead of using the actual size of 480X800. How can I force it to display at the actual screen size instead of scaling for a smaller resolution?

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