Re: Threads - C# Discussion Boards

Re: Lit the Num, Caps and Scroll lock light?

DaveyM6930-Aug-09 22:21

30-Aug-09 22:21

In case you haven't solved your issue completely - I have posted an article on this subject that is a full solution, dealing with many problems that I encountered that you may not yet have come across.

Thanks for your post, it inspired the article!

Toggle Keys Controller Article[^]

Dave
BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)
Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
Why are you using VB6? Do you hate yourself? (Christian Graus)

Re: Lit the Num, Caps and Scroll lock light?

Mc_Topaz31-Aug-09 5:06

Mc_Topaz

31-Aug-09 5:06

Thanks!

Tried to understand your solution, but it's maybe to advance for me, not much code-comments either.

But your solution proves that it's possible to do lit the keyboard lights with a C# program. Now I know it's possible Smile | :)

Re: Lit the Num, Caps and Scroll lock light?

DaveyM6931-Aug-09 8:53

DaveyM69

31-Aug-09 8:53

If you either copy the files in the Keyboard project into your own, or add a reference to the Keyboard.dll file to your solution, you don't need to worry about how I've implemented it - you can just use the properties, events and method(s) of the ToggleKeyController class as I have done in the demo (if you look at the code in FormMain.cs).

Threads

jpk42028-Aug-09 0:33

jpk420

28-Aug-09 0:33

Hello All ,

I have requirement that User will have list of Directories . the moment user selects a Directory
Thread s hould be started and It s hould display List of Txt files name and dates in Grid .

User can change the directory and the thread should show the files of that directory in grid

I have done the code like this

public static DataTable GetFilesinDirectory()
{
DriveInfo Drive = new DriveInfo(strDriveName);

DirectoryInfo[] DirectoryList =Drive.RootDirectory.GetDirectories(strDirectoryName);

DtFilesList.Rows.Clear();
// DtFilesList.AcceptChanges();
FileInfo[] FilesList = DirectoryList[0].GetFiles("*.txt");

foreach(FileInfo ObjInfo in FilesList)
{
DataRow drFileInfo = DtFilesList.NewRow();

drFileInfo["Name"]=ObjInfo.Name;
drFileInfo["CreationTime"]=ObjInfo.CreationTime;
drFileInfo["Extension"]=ObjInfo.Extension;
drFileInfo["LastWriteTime"]=ObjInfo.LastWriteTime;

DtFilesList.Rows.Add(drFileInfo);
}
return DtFilesList;

}

This method is assigned to thread

strDirectoryName will be updated once user selects the Directory

But problem is Since it is Static method I cant acces the Grid then how should i Bind ?

Re: Threads

Luc Pattyn28-Aug-09 0:48

Luc Pattyn

28-Aug-09 0:48

Hi,

if static were the problem (I'm not really sure), why don't you drop the static keyword? A thread does not require its runner method to be static.

Smile | :)

Luc Pattyn

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Re: Threads

jpk42028-Aug-09 1:34

jpk420

28-Aug-09 1:34

Okie Let me tell the requirement ..

A thread should be there which will pool a folder for every 5sec and show the list ofiles in grid with the new changes

Re: Threads

Luc Pattyn28-Aug-09 1:41

Luc Pattyn

28-Aug-09 1:41

I see no problem (maybe that's because I don't read code when it is not in PRE tags).
Try to be specific: what is it that happens and you don't like; or you would like to happen but it doesn't?
And use PRE tags.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Re: Threads

jpk42028-Aug-09 1:46

jpk420

28-Aug-09 1:46

what i have done is I binded DatatTable to binding Source and then binded that Source to that Grid .

No i Have written a method which will get List of all the files for slected directory and store it in the DatatTable which is binded to the source .

This method i have assigned to the thread ..

Now the datattable is getting updated but the Grid Is not getting refreshed ???

That is the problem

Re: Threads

Luc Pattyn28-Aug-09 1:50

Luc Pattyn

28-Aug-09 1:50

My experience with data binding is limited.

If the control is not tracking your changing datasource, the one way I know how to fix it is by setting the datasource to null, then assign the real one again. And maybe, never tried it, Control.Invalidate() also works.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

Re: Threads

OriginalGriff28-Aug-09 5:17

OriginalGriff

28-Aug-09 5:17

Luc, isn't it a simpler problem? If he is indeed using separate threads, then he can't update the grid anyway without invoking the GUI thread - can he?

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Re: Threads

Luc Pattyn28-Aug-09 5:57

Luc Pattyn

28-Aug-09 5:57

Yeah, one shouldn't touch the data binding properties from another thread, unless through Invoke. Not sure that's the problem, it could well be. This whole thread is unclear to me.

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

object typeconversion syntax error

myinstincts28-Aug-09 0:29

myinstincts

28-Aug-09 0:29

Below is the code written in row editing event of data gridview(in assumption that row editing can only be done if some control like textbox is there)
(TextBox)(GridView2.Rows[0].Cells [2]) = "a";

But is this syntax of object conversion correct?It is giving error as system cannot convert type string to system.web.ui.webcontrols

Re: object typeconversion syntax error

stancrm28-Aug-09 0:31

stancrm

28-Aug-09 0:31

yes, because "a" is a string, not a textbox.

Re: object typeconversion syntax error

Keith Barrow28-Aug-09 0:46

Keith Barrow

28-Aug-09 0:46

Try

((TextBox)(GridView2.Rows[0].Cells [2])).Text = "a"; Smile | :)

Need BHO Solutions

Jacobb Michael27-Aug-09 23:49

Jacobb Michael

27-Aug-09 23:49

Hi all,

Through IHTMLElementCollection we can get all the IHTMLElement.

I want to find out all the HTMLInputButtonElement that is in the current DOM.

How to navigate (frames,iframes,divs,tables) and find out the HTMLInputButtonElement

Is there any common algorithm.

Thanks in advance

How to Accept password in ** format during installation.

RA|-|UL PATEL27-Aug-09 21:56

RA|-|UL PATEL

27-Aug-09 21:56

I have created setup in C#.net using C# setup project.
I am Accepting servername,username,password in textbox.
Textbox has been added in setup project by adding textbox dialog in user interface..

but how to Accept Password in ** format during installation.??
Thanks in advance.
Smile | :)

Re: How to Accept password in ** format during installation.

OriginalGriff27-Aug-09 22:02

OriginalGriff

27-Aug-09 22:02

Try:
Password Textbox[^]

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Re: How to Accept password in ** format during installation.

RA|-|UL PATEL27-Aug-09 23:04

RA|-|UL PATEL

27-Aug-09 23:04

Thanks dear.
For your valuable suggetion.

But for installation time textbox there is no such property exist.
This textbox is textbox dialog box which is provided in .net in set up project.

Re: How to Accept password in ** format during installation.

OriginalGriff27-Aug-09 23:46

OriginalGriff

27-Aug-09 23:46

Then what you have to do is provide a Custom Action[^] which should allow your own dialog.

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Re: How to Accept password in ** format during installation.

Manas Bhardwaj28-Aug-09 0:31

Manas Bhardwaj

28-Aug-09 0:31

Apart from this you will need to use the Orca [^]utility to change the textual style of textbox.

Manas Bhardwaj
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Cannot perform '=' operation on System.Char and System.Boolean. exception

acroitoriu27-Aug-09 21:41

acroitoriu

27-Aug-09 21:41

Hi all,

I am developing a winforms application and, in order to store some data on the client side I am using a dataset. My problem is that for a particular table (nothing different in settings compared to other datatables in my dataset), I get an exception when I try to insert a new Row.
I will not paste any code in here as I don't think that it will help anyone, but what I do is:

* create new row object using: MyDataSet.MyDatatableRow row = datasetInstance.MyDataTable.NewMyDataTableRow();
* I populate the columns I need
* I try to add the row to the datatable: datasetInstance.MyDataTable.AddMyDataTableRow(row);

At the very last step (add to datatable), I get an exception saying: "Cannot perform '=' operation on System.Char and System.Boolean."
I tried to see if I am doing something wrong while setting the column value, but everything looks fine... also I already waste lots of time on google trying to find an answer, but no success.

Can anyone explain to me why this exeption occurs? Any idea what could be wrong, what should I try in order to fix this?

Thank you in advance!

Andrei

Re: Cannot perform '=' operation on System.Char and System.Boolean. exception

Vimalsoft(Pty) Ltd27-Aug-09 22:10

Vimalsoft(Pty) Ltd

27-Aug-09 22:10

Can we see the code ?

Vuyiswa Maseko,

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Re: Cannot perform '=' operation on System.Char and System.Boolean. exception

acroitoriu27-Aug-09 22:30

acroitoriu

27-Aug-09 22:30

To be honest, I don't see how this will help. Besides the code (which is quite long as there is business logic), I should paste also the datatable structure. Anyway, I have similar logic with many other datatables in the dataset, and I didn't get this exception so far. If you think that this is related to the way I populate the data, I will try to prepare the copy of my code and maybe a description of the datatable structure in case you think it will help.

Re: Cannot perform '=' operation on System.Char and System.Boolean. exception

DaveyM6927-Aug-09 23:08

DaveyM69

27-Aug-09 23:08

Well most likely, you are trying to store a boolean value in a field that takes char. Without code or a crystal ball I don't see how we can offer any more help. Just post the relavent bits (in <pre></pre> tags). Stripping out some of the chaff and validation/business logic will not only make it readable, but you might see where the problem lies.

Re: Cannot perform '=' operation on System.Char and System.Boolean. exception

Luc Pattyn28-Aug-09 0:36

Luc Pattyn

28-Aug-09 0:36

Someone has to check the code, if you don't, and you don't publish any, who will?

here is a twin suggestion:
- exceptions most often contain file name, line number and method name information; to see it all, make sure you output Exception.ToString() and not just Exception.Message
- your IDE is capable of showing line numbers in all editor windows; make sure to switch that on. For Visual Studio, see here[^].

Smile | :)

Luc Pattyn

Have a look at my entry for the lean-and-mean competition; please provide comments, feedback, discussion, and don’t forget to vote for it! Thank you.

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