C# - Update Image In Page From Memory Without Refreshing The Page?
Apr 3, 2010
I have a command line C# server and an ASP.NET client, they both communicate via .NET Remoting. The server is sending the client still images grabbed from a webcam at say 2 frames a second. I can pass the images down to the client via a remote method call and the image ends up in this client method:
public void Update(System.Drawing.Image currentFrame)
{
// I need to display the currentFrame on my page.
}
How do i display the image on the a page without saving the image to the hard disc? If it was a winForms app i could pass currentFrame to a picturebox ie. picturebox.Image = currentFrame.The above Update method gets fired at least 2 times a second. If the client was a winForms app i could simply put picturebox.Image = currentFrame and the current frame on the screen would automatically get updated. How do i achieve the same effect with ASP.NET? Will the whole page need to be reloaded etc?
I have 4 Image buttons on my user control and on the click of that Image button, I am opening new pop up window. I had used update panel but still it is refreshing the page. I don't want to refresh my page on the click.
I have a requirement where a user logs on to a server where exists a website. The user bring up the site on a browser on that server and loads a power point presentation slide. At that time, users using their laptop clicks on the link to that site and sees that particular PPT slide loaded on the server. Then the operator/user on the server clicks on the second slide and the laptop would now see the second slide. Is this possible to do? If yes, then what technology to use? DHTML? or something else.
I have added update panel and gridview in my page. When I click on any Image Button which is in Gridview, the page refreshes at that time. I don't want my page to refresh.
I have 2 asp:TabContainers on the Page. The first one contains an Image control. The second one has a dynamic TreeView on one of the TabPanels. When I click one of the treenodes I change the URL of the image in the First TabContainer. However it refreshes the entire page. How to prevent that from happening? Below is the code behind when the treenode is clicked.
I'm manually triggering an update panel refresh using javascript (long story- but it has to be this way), but I still see a page flicker outside of the update panel, so I'm concerned that the whole page is getting refreshed rather than the update panel. Any way I can determine this? Perhaps some value in the code-behind on the postback? Or some client side trick? If the jQuery $(document).ready() event fires, does that mean the whole document is refreshing or just the update panel?
I'm trying to show some data in the update panel refreshing every second using page method. Everything works fine until I introduce Session. As soon as I save some data into the session my Ajax Page method is not called every second. Here is the complete code
Test.aspx
[Code]....
Test.aspx.cs
[Code]....
why after clicking "Enable Session" button refresh stops working?
how can i use the refreshing a part of the web-page without all the web-page am using c#.net, it will be great if there is an example to how you can do that also i need to know how can i use the iframe to do that, or a good way to do that
I have an updatepanel on my master page that just updates the database every 30 seconds, what is happening is that everytime it is fired, it will refresh everything on the page_load of the content page that are not under ispostback = false. to disable such a thing just for this specific updatepanel?
i have four web pages like(home,aboutus,contactus,loginform) and 1 masterpageby using link button i am navigating 2 this pages... while navigating the total page is refreshing... i dont want like thtonly content place holder should change.... without refreshing the page....
I am having an issue with content page refresh, when I change something in master page. My scenario is, I have a login button present in master page, on click of which am loading a modal popup with login controls. Once the credentials are valid, i am hiding the modal popup and stroing the user authentication result in a Session object. In content page's page load event, I am checking for this session object, for showing/hiding some of the controls based on the user logged in.The problem is, after login, the content page is not getting reloaded and proper controls are not shown to the user. To make the content page refresh programmatically, i added an UpdatePanel in content page and refreshed it after login button click event in master page. But still content page is not getting refreshed.
I am a beginner to web development and ASP.NET. I am creating a web application (not public, so SEO, bookmarking etc. is of no concern) with the typical layout of header on top, Navigation on the left, content on the right. I want the content to update without the whole page reloading when selecting something on the navigation bar. What is the typical way to implement this? MasterPage with ContentPages and using an UpdatePanel (tried this, but does not seem to work, I guess because the URL is different for each content page)? Using Frames? Using an iFrame for the content part? UserControls for the content part
I have a dynamically generated image placed inside an update panel. The image is generated with the Generated Image control (see here for more:
[URL]. This is basically a specialised httphandler linked to a normal asp:image, where the image src is generated dynamically. In my case, I use some GDI+ to dynamically generate the image, based on values from a database query.
The problem I have is that the image does not update when the update panel updates. The image does, however, update if I manually reload/refresh the page (i.e., hit F5). Why is is that some code fires during an update panel update, and not other code? And, more importantly, what can I do to make sure the image generation code does fire during the updatepanel update?
I have created one web application with forms authentication.Whenever I logged in to the application and hit F5, it takes me to the login page instead refresh.
I'm a novice to ASPX, and am trying to create my first real page with C#. I'm an accomplished web developer, but new to .net. When I create a new page and launch it, all is good, however when I make a change to the page and relaunch, it will not refresh. Even when I clear my cache, it still won't refresh.
I have a dropDownList on a page that I need to refresh with new database entries whenever new content is added to my DB.Basically, I have a list of usernames in one dropdown, and when I add a new username to the database I want this to be reflected in the dropdown without refreshing the whole page i.e. on the fly.I have used update panel but partial postback is occuring but i want page should not refreshing at allI hope someone can help, I have looked around and not found any solutions.
I am creating a register form and when the user clicks on the confirm password field, the page refreshes and I lose the text from the other field (the password field)
I have a button on my aspx page on clicking which i get a new enquiry no in my textbox. It is working very much fine.But problem is that even when i refresh my page, it will get a new enquiry no.I only want a new enquiry no to be displayed in textbox whenever i click on button.This is my c# code for button_click event-
i have web page it has a page header content like main menu,logo and so..on..
and in iframe i am loading the side menu and content. while loading the web page i am using an empty home page to display. after some time in mid of some page while refresing the page it reloads the home page. But i need to display the page that i am using as a current page
code is
[code]....
in that iframe deafult page is Homepage.aspx,it is empty page. When i clicked the sub menu it loads the content like AddMaster.aspx. When i refresh the page it loads Homepage.aspx, but i need to display AddMaster.aspx
i have a page which consists of a drop down box.in that drop down box i am having two values namely start and stop. i enable the autopostback property to true. when user selects start or stop from dropdowm box, the page is refreshing.now what i want is...when the user selects stop from dropdown box..the page should nt refresh.
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