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Listview in Virtualmode 11 Years Ago by kaizen202 … in virtual mode with the property listView.VirtualMode=True and I have subscribed the event …code. public class Form1 : Form { public Form1() { listView1.VirtualMode = true; listView1.VirtualListSize = 100000; listView1.RetrieveVirtualItem += new RetrieveVirtualItemEventHandler(… Re: Listview in Virtualmode 11 Years Ago by lolafuertes Every time you need to acces to a listview ítem, the virtual retriever is called, as many times as needed, to obtain the virtual ítems collection for the purpose of the current action being done. See [this](http://msdn.microsoft.com/en-us/library/system.windows.forms.listview.virtualmode.aspx) info from the library. Hope this helps "cannot create a window handle" exception 9 Years Ago by Username87 … other Form containing another data grid view with the property **VirtualMode** set to true and a **NewRowNeeded** event and a row… Re: Sort DataGridView Column by a Custom Value List 13 Years Ago by captainm … is not bound to an external data source and the VirtualMode property value is false. To customize sorting for columns bound… Re: datagridview editing won't work? 9 Years Ago by MRAR i solved it with "VirtualMode=False". Re: "cannot create a window handle" exception 9 Years Ago by tinstaafl It sounds like you're not disposing of the old forms before you create new ones. You'll probably have to show the relevant code to see what is going wrong. Re: "cannot create a window handle" exception 9 Years Ago by Suzie999 Is this your code or third party app? Re: "cannot create a window handle" exception 9 Years Ago by cgeier Where did you get the information regarding number of handles from? Re: "cannot create a window handle" exception 9 Years Ago by Amr_Mohammad_R Suzie999 no its not a third party app and its not my app meant I'm not the one who wrote it is already an existing app within the company where I'm working and I'm trying to fix the bugs issued by it. cgeier You can know the number of User objects, GDI objects, Threads, and Handles beside many other things of all applications running in your PC … Re: "cannot create a window handle" exception 9 Years Ago by cgeier What OS is your computer using? Win7? What are the page file settings for your computer? You're going to probably have to post some of the code--the part that fires when you need to retrieve more rows and the part that retrieves the rows. Also some screen shots of what you are talking about may be useful. Re: "cannot create a window handle" exception 9 Years Ago by cgeier Also what database software are you using/accessing? Re: "cannot create a window handle" exception 9 Years Ago by Amr_Mohammad_R cgeier We are using Windows 8. OK I will post a code similar to the one who has a problem Re: "cannot create a window handle" exception 9 Years Ago by Suzie999 Just to clarify, you do have access to the source code of the app? Seems like a lot of handles to be open really, I thought it was the garbage collector to deal with that if user does not dispose of objects themselves. But I suppose there are cases where the garbage collector determines that an object is not finished with depending on the way it … Re: "cannot create a window handle" exception 9 Years Ago by cgeier It is important to either use "Using" statements and/or call the "Close" method for unmanaged code (such as COM objects). In short, if a "Close" method exists, use it. Is this only occuring on one computer?