You might be trying to modify TrustedInstaller keys. TrustedInstaller is a special user that has power beyond that of Administrator(s). You will need to take ownership of the key in order to work around that (completely ruining the security on your user's machine). If you need to change keys owned by TrustedInstaller you are doing something very very wrong.
If you are not trying to modify TrustedInstaller-owned keys you probably need to indicate which permissions you want when you open the key:
using (var key = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Foo\\Bar", RegistryKeyPermissionCheck.ReadWriteSubTree))
// .. or ..
using (var key = Registry.LocalMachine.CreateSubKey("SOFTWARE\\Foo\\Bar", RegistryKeyPermissionCheck.ReadWriteSubTree))
He who asks a question is a fool for five minutes. He who does not ask a question remains a fool forever. [Chinese Proverb]
I am currently a student in TYBSC(IT) so I had a query that in C# windows form If for example a clientname combobox is there and on selecting the client Name in the combobox the 2 text boxes clientAddress and ClientNumber should be retrieved from the database and get filled in the textboxes.
Sir please help me in my project my mailing me a demo program so that I can Find A Solution to It.
Please Sir and as sson as possible as jan end is ma submission date
publicpartialclass Form1 : Form
string Id = "";
string Address = "";
privatevoid Form1_Load(object sender, EventArgs e)
// TODO: This line of code loads data into the 'database1DataSet1.Test' table. You can move, or remove it, as needed.
privatevoid comboBox1_SelectedIndexChanged(object sender, EventArgs e)
string SelectedId = Convert.ToString(comboBox1.SelectedValue);
if (Convert.ToString(comboBox1.SelectedValue) != "")
database1DataSet1.DataSource = Database1DataSet1TableAdapters.GetData(int.Parse(SelectedId));
var Id = from r in testTableAdapter.GetData()
where r["Id"].ToString() == SelectedId
var Address = from r in testTableAdapter.GetData()
where r["ProductId"].ToString() == SelectedId
foreach (var unit in Id)
Id = id.ToString();
foreach (var measure in Name)
ProductMeasure = measure.ToString();
textBox1.Text = Id;
Hello everyone! I would like to know how I can read metadata of exported types using the Managed Extensibility Framework. I am using Visual Studio 2008 with .Net Framework 3.5.
In .Net Framework 4.0, this can be achieved through type 'Lazy' but this is not available in .Net Framework 3.5.
Since 'ExportMetadata' was provided in the version of MEF provided for .Net Framework 3.5, I do believe there is a way of reading the metadata in the framework 3.5 but I don't know how this is done. Any guidance, please?
When you add a reference over the network, the IDE will make a local copy of this dll anyway.
So, nothing should be stopping you from copying the dll to your own machine / project folder and referencing it from this local location.
i use c# with asp.net ,i didn't understand how to add zoom bar to my google map.
in the aspx file the map configure like this:
<cc1:GMap ID="GMap3" runat="server" Width="850px" Height="500px" Language="he"
and the key is configure in the cs file.i saw lots of exsample but evrything in aspx file ,and if i try to change there something i have error in the visual studio.
so i hust want to know how to add this zoom bar in the left
Have a self-hosted WCF REST service w/ custom authentication (UsernamePasswordValidator). I need to return business specific errors from the validator. All methods I have tried to do this with have failed because all the errors get hidden by the HttpWebRequest object in a generic "Forbidden." error. My latest attempt was to write an error code back. Normally, I would do this by using the OperationContext.Current to get the response stream, but OperationContext.Current = null. How does one initialize this in a self-hosted service?
I have a form with a progressBar on it. I'm doing writes in another class (through my interface) and need to show my progress of doing the writes, but I'm getting an error message *. Hopefully someone has an idea how to get the error to go away and so I can update my progressBar from a different class.
I'm more of a C++ developer doing C#, so there might be something that an experienced C# person would know of that I'm missing.
It looks like this:
Form with progressBar displayed
privateint writeIt(refbyte wDat, byte sDat)
result = cr.ProcessTWriting(ref wDat, ref pb_Progress.Value); //this passes a ref to the progressBar value
* In the code above, I'm getting "A property, indexer or dynamic member access may not be passed as an out or ref parameter" error message.
My interface looks like this:
iCR.cs (which is in another VS project due to future CR6, etc. which will use the interface)
int ProcessTWriting(ref byte wDat, refint pb_value);
Then, I want to pass my references (to progressBar value) to where I'm writing my bytes (i to 1024), and update the reference to the progressBar as it iterates through, writing to it's destination.
This would be in my CR5.cs which implements iCR.cs (and is in another VS project still...think Factory pattern):
Sorry in advance for my english. Possibly is not good enough yet...
Do you have the possibility to change your interface?
I'm thinking that a solution to your problem could be the use of events on your CR5 class. (Observer pattern)
You could create an event on CR5 class that can be subscribed by the class that contains the progress bar. Then, you can fire your event on the AttempWrite function with a parameter that indicates de current progress value to set into the progress bar.
Is it a possibility? Or are you constrained to this interface contract?
That's a good idea. I'll give that a try. I can absolutely change my interface. That's why I'm showing the progressBar value in the interface now. I'm not absolutely sure how to send a value when I fire an event, but I'll take a look. Thanks!
inside one of the Framework class. likewise we can also define our own delegates that suits to our need. here instead of using the native handler I defined a custom delegate to fire an event. Read the following articles which explains more about events and delegates. Events-and-Delegates-Simplified and Step-by-Step-Event-handling-in-C#
class MyCR: CRInterface
publicevent ProgressChangeHandler ProgressChanged;
publicint ProcessTWriting(refbyte WDat, refint pb_value)
status = AttemptWrites(ref pb_value);
privateint AttemptWrites(refint pb_value)
for (int i = 0; i < ((wDat.Length) / 4); i++)
//as it does writes, I want to set pb_value here to % complete
privatevoid RaiseProgressChange(int progress)
Finally Subscribe for event change in your FormClass i.e PC.cs
// call this line just below where you create the instance of CR5 class
cr.ProgressChanged += new ProgressChangeHandler(CR_ProgressChanged);
privatevoid CR_ProgressChanged(int progress)
progressBar.Value = progress;
The above code sample is working version if you closely look at the sample you can find that delegate method is defined in the dll where iCR is located and you don't need to use the Public access specifier for Interface methods and data.
This will definitely work and I have done same stuff in the past.
ProgressChangeHandler must be defined globally so that this delegate is accessible by all members.
If I could add one more little question onto the above, which I got to work. I also have a C_Comm.cs class which is referenced in my CR5.cs, the original PC.cs, and iCR.cs. It turns out that one area I need to update my progress bar (in PC.cs) from is C_Comm, which is also in a different VS project. I'm trying to get it working, and am getting an error: Cannot implicitly convert type 'ProgressChangeHandler' to C_Comm.ProgressChangeHandler'
Right now it looks like this:
PC.cs (the form code)
publicevent ProgressChangeHandler ProgressChanged;
cr.ProgressChanged += new ProgressChangeHandler(updateProgressBar); //cr is instance of CR5 through iCR interface/factory
cb.ProgressChanged += new ProgressChangeHandler(updateProgressBar); //cb is C_Comm
publicint updateProgressBar(int i)
pb.Value = i;
I tried to just have the delegate in my C_Comm.cs (not in iCR), and now in my CR5.cs class, I get the error "The name 'ProgressChanged' does not exist in the current context" in my RaiseProgressChange method. Then if I try to use cb.ProgressChanged != null, I get the error "The event 'C_Comm.ProgressChanged' can only appear on the left hand side of += or -=". I'm not very clear on using events! Do you have any ideas?
C_Comm.cs is a separate VS project, separate dll, commonly referenced by everything (CR5.cs, PC.cs). Do you think I still need everything except the delegate part in my iCR? The CR5 implements iCR and that's the only way I can see getting the ProgressChanged defined in CR5 from PC.cs, but when I take out the delegate part, I get "The type or namespace name 'ProgressChangeHandler' could not be found (are you missing a using directive or an assembly reference?)". I can't keep my iCR.cs and C_Comm.cs in the same dll because of the whole layout. The VS project layout is:
Project 1 has iCR.cs
Project 2 has PC.cs and a couple of other things. (update - this has form with progress bar)
Project 3 has CR5 (implements iCR) and a couple of other things.
Project 4 has CR_Factory which will return a CR5 through the iCR interface to my PC.cs
Project 5 has C_Comm.cs. It is referenced in PC.cs, CR5, and iCR.
In the future I'll have a CR6 project like the CR5.
As far as cb.ProgressChanged != null, I'm just trying to get what you suggested originally to work with my delegate in my C_Comm. Yes, checking for null before I send the update.
I wound up leaving the original delegate in my iCR and everything you originally recommended above. Then I created a separate delegate and handler in my C_Comm.cs class. I couldn't see any other way to update my progressBar and also share the same delegate and event. Thanks for the help!
I dont see any error in your declaration, i.e the delegate method is declared in Comm.cs file which is referred in all the other 3(or more project) iCR,CR5 and form Class. so the delegate should be available in all other classes and you need to include the proper namespaces in other project files.
Thank you so much for the help. We have a very small work group here, and they are not programmers and don't understand this stuff (not to mention me having a tough time with events and this architecture). It turned out I wasn't "using" C_Comm in my interface. Once I did that and fixed a couple of declarations to use the C_Comm version of the Handler, all worked.