First of all you should have a flag field on your users table which determines which user are online. On my databases this field I name it as "logged" with the type of bit and then on the time when the user is logged to the application then this field will be updated to true and on the time when he is loged out then will be false. Since you have this flag on your users table it's very easy to know which users are online.
Do you really need to sort the collection itself or just view it as sorted without changing the underlying collection? If the first, follow the previous answers. If the second, then you can just expose an ICollectionView[^] and bind to that rather than to the root collection.
hi frnds im doing a project and in a face of adding a forum in my project so is there anyone who can help me....with code or ideas regd forum in .net c#.....im new here and wish ur help and support dear friends........
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I built a plugin for a parent application on an x86 OS at work, and came home to try it and it would not work. I got the error code of "0x8007000B" when trying to load the dll which lead me to find out that because dll was set to build to anycpu there is some sort of conflict.
Does anyone have any idea as to how to fix this so that it always works, no matter the CPU architecture?
There is no general solution, applicable to all applications. The fundamental rule is a process must be homogeneous, i.e. consist of all x86 or all x64 code; so e.g. you can't build a plug-in that works for both a 32-bit and a 64-bit native app (say Internet Explorer).
However, if app and plug-in are both managed code, then building for x86 should always work, as each x64 processor and Windows version (at this moment) is able to execute x86 code as well. One caveat: you need all referenced files on your machine, and that may be tricky in some situations.
Remark: Visual Studio Express doesn't let you choose, it generates "AnyCPU" (Google will yield some work-arounds though). Full Visual Studio lets you choose, unfortunately the default is "AnyCPU", which may cause your app to start as a 64-bit process, to later discover some needed native file isn't available for 64-bit (warning: on Win64, 64-bit system code resides in system32, and 32-bit code in systemWow64!).
With some further troubleshooting, I have discovered something interesting. I thought the problem was the plugin dll I had written, but it turns out it was actually a resource dll that was inside of my projects plugin dll. So the hierarchy is this:
I do not have any control over either the Parent Applications code or the resource dll. It looks as if when the Parent application and the plugin I wrote are ran as a 64bit application (on a 64bit OS) the resource dll will not load. Does this sound like a reasonable diagnosis? If so, is there a work around for this situation?
The main code decides on the word size of the process (either directly by being built for 32 or 64bit, or by looking at the OS when managed and "AnyCPU"); everything else must comply to the top-level code.
Hence, if resource.dll is 32-bit, it all must be 32-bit; there is no way around that.
Version : v2.0.50727
CLR Header: 2.5
PE : PE32
CorFlags : 1
ILONLY : 1
32BIT : 0
Signed : 0
I forced it to 32bit and tried to start it, 8 other dependencies are failing, probably because they have the 32bit flag set to 0 so I shall scrap this idea unless there is a way to do something similiar on the unmanaged resource.dll .