Re: [database] understand if the field contain a value - C# Discussion Boards

check if .net framework is not installed

Mohsen Saad9-May-05 4:17

9-May-05 4:17

hello,

I am creating an application in .NET I want the application to display a message to inform the user that the .net framework should be installed instead of saying there is a missing dll when the user tries to run the application

Re: check if .net framework is not installed

MoustafaS9-May-05 4:26

MoustafaS

9-May-05 4:26

You can simly use the .NET bootstrapper ,it will check if the .NET is installed and, if so it will install youe application ,otherwise it will install the .NET frmaework by it self and after installing it will start your application installation immediatly.
http://msdn.microsoft.com/vstudio/downloads/tools/bootstrapper/default.aspx[^].

Re: check if .net framework is not installed

Dave Kreskowiak9-May-05 4:44

Dave Kreskowiak

9-May-05 4:44

Your requirements are self excluding. You can't create a .NET application that checks to see if the .NET Framework is installed. It HAS to be installed before you launch your application, otherwise, how is it going to launch in the first place?

You have two options.

1) Your installer must handle installing the .NET Framework required by your application.

2) You write a launcher application in Visual C++ (not Managed C++!!) that checks for the existance of the correct version of the .NET Framework, then if found, launches the real application, and if not, puts up a dialog telling the user to install the correct version of .NET.

Option #1 is MUCH easier to deal with.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

multi threading & progressBar problem

gaby2r9-May-05 3:53

gaby2r

9-May-05 3:53

<br />
public void task()<br />
        {<br />
            Thread.Sleep(9000);<br />
        }<br />
private void button_Click(object sender, System.EventArgs e)<br />
        {<br />
            this.progressBar1.Value=0;<br />
            Thread t=new Thread(new ThreadStart(task));<br />
            t.Start();<br />
            while((t.ThreadState & (System.Threading.ThreadState.Stopped | System.Threading.ThreadState.Unstarted)) == 0)<br />
            {<br />
                if(this.progressBar1.Value==this.progressBar1.Maximum)<br />
                {<br />
                    this.progressBar1.Value=this.progressBar1.Minimum;<br />
                }<br />
                this.progressBar1.PerformStep();<br />
                Thread.Sleep(500);<br />
            }<br />
            t.Join();<br />
        }<br />

works the first time, progressbar progresses nice and neat, never works again. what am i missing here?

Re: multi threading & progressBar problem

Dave Kreskowiak9-May-05 4:39

Dave Kreskowiak

9-May-05 4:39

You'd be better off encapsulating your ProcessBar code into it's own seperate control. Something that includes it's own Timer to increment itself. You could than use this control in whatever project you wanted and you wouldn't have to worry about coding some custom garbage like what you posted.

Take a look at this[^] article on MSDN for an example.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: multi threading & progressBar problem

S. Senthil Kumar9-May-05 4:50

S. Senthil Kumar

9-May-05 4:50

I don't know how it works the first time. You are blocking the UI thread by looping till the worker thread completes. So your calls to PerformStep won't really get through till button_Click completes, by which time you're already done.

I'd suggest that you update the progress bar from the worker thread (by using BeginInvoke/Invoke as this[^] article describes.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

[database] understand if the field contain a value

Sasuko9-May-05 3:42

Sasuko

9-May-05 3:42

i make a query on my database.
I want the image data inside a row.
I select it and i start to read data.
The problem is that sometimes there is no data inside, so if i try to read i get exception.
Can i check if there is data inside that field before start ot read?
That field doesn't support NULL default value.

i use Microsoft Access database .mdb and ADO.NET

Re: [database] understand if the field contain a value

Dave Kreskowiak9-May-05 4:31

Dave Kreskowiak

9-May-05 4:31

If the field doesn't support NULL and it can be blank, then your only option is to check the length of the data in the field. Images are usually going to be more than 0 bytes long.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

How to Rotate Controls?

RajeshGuptha9-May-05 3:37

RajeshGuptha

9-May-05 3:37

Hi,
I want to rotate a control, take for example a button Control or a label control to some angle. But i dont know how to attain that..
i tried setting the region of the control with a graphics path whose transform set to rotate about its center...but im not able to get the output...
Can anybody help me?

Thanks,
Rajesh

Re: How to Rotate Controls?

Dave Kreskowiak9-May-05 4:30

Dave Kreskowiak

9-May-05 4:30

Off the top of my head, you'll have to create your own version of the controls you want to visually rotate and supply the functionality for it.

There may be another way to do it by dropping the controls in some other container and rotating the container somehow, but i really can't see that happening.

Another option is a 3rd party Windows Forms Control library.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: How to Rotate Controls?

therealmccoy9-May-05 9:30

therealmccoy

9-May-05 9:30

Right off the very tip top of my head....

Could you just decrement the X size/location and increment the Y size/location in a for loop (or do loop)? The text wouldn't rotate, but the control would appear too.

Just a thought.

Of course you have to mark your start position and reverse at 90 degrees, etc, etc...

www.lovethosetrains.com

Re: How to Rotate Controls?

Dave Kreskowiak9-May-05 11:31

Dave Kreskowiak

9-May-05 11:31

No, it wouldn't. It would just make the button appear tall and narrow, not rotated to any angle. Re-read the original post...

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: How to Rotate Controls?

RajeshGuptha10-May-05 2:46

RajeshGuptha

10-May-05 2:46

Actually i tried transforming the region of the control to a rotation...
for example,
Region reg = new Region();
Matrix matObj = new Matrix();
matObj.RotateAt(/*some angle*/, /*with respect to some point*/);
reg.Transform(matobj);
myControl.Region = reg;

Iam able to attain the rotation...but supposing the region (reg in this example)is in another shape(than rectangle)...say ellipse, then the shape of the ellipse is not visible completely....reason is that the rectangle coordinates(i.e. the original rectangle size) used to draw the ellipse is smaller than the rotated structure...(after rotation, the location of points are actually out of the bounds of the controls client rectangle...)
So i tried to get the size of the outer rectangle which has completely both the original and the rotated rectangles... by some trignometry...
but nope, im not getting the exact coordinates...
can you help me in this??
I

Thanks and Regards,
Rajesh

Retain values

esjq9-May-05 3:13

esjq

9-May-05 3:13

Hi!

What is the best way to retain a value between sessions. For example, if you have a login dialog and the user account name is likely to be the same the next time the application starts, what is the preferred way to fill the textbox with user account name from the previous time?

Thank you Smile | :)

Re: Retain values

Dave Kreskowiak9-May-05 4:27

Dave Kreskowiak

9-May-05 4:27

You can either store it in the Registry, probably under the CurrentUser key, or in a file somewhere.

But, keep in mind, this is considered a mild security risk. You might also want to include an option to turn this feature on/off.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Open Files

eng.mohamed9-May-05 2:14

eng.mohamed

9-May-05 2:14

I want the button handeller "btnOpen_Click" to open a spacefic folder has this path (D:\MyFolder) what can i do ?
thanks in advance . Confused | :confused:

misho

Re: Open Files

mav.northwind9-May-05 3:02

mav.northwind

9-May-05 3:02

You can browse the documentation for OpenFileDialog[^] and use the InitialDirectory property.

mav

C# Discussion Board

Illegal Operation9-May-05 1:24

Illegal Operation

9-May-05 1:24

Hi,

Can someone please tell me where I can find a Step-by-Step guide to building a Forum Discussion Board?

Thanks!

Illegal Operation

WannaBe and GonnaBe Systems Developer

Re: C# Discussion Board

MoustafaS9-May-05 4:46

MoustafaS

9-May-05 4:46

http://www.codeproject.com/asp/codeproject-forum.asp[^]
This is a description of the CP forums ,and also microsoft has released a free code for its community in a web site named Roll eyes | :rolleyes:

communityserver but i really don't remember the URL Roll eyes | :rolleyes:

if you googled it you will of course find it,and its in C# .

How do I expose a Windows Service procedures and functions so that i can call remotely??

AfzalHassen9-May-05 1:24

AfzalHassen

9-May-05 1:24

Hi,

i'm trying to develop a C# windows service that needs to expose procedures and functions that will be called remotely via an application that is going to be developed in delphi 6.

i'm totally new to distributed applications, so if anyone can give me some guidance as to how i can accomplish this, i will be VERY greatfull.

Thanks a million!

Afzal Hassen

How to Create a C# Application to uninstall Applications

pubududilena9-May-05 0:17

pubududilena

9-May-05 0:17

hi all,
I want to write a C# Application to Uninstall Applications(Exes)?
Can any one guide me?

thanks in advance..

Re: How to Create a C# Application to uninstall Applications

Colin Angus Mackay9-May-05 1:33

Colin Angus Mackay

9-May-05 1:33

Visual Studio already provides a number of setup and deployment projects which will uninstall the software via the Add/Remove programs control panel applet.

My: Blog | Photos | Next SQL Presentation
WDevs.com - Open Source Code Hosting, Blogs, FTP, Mail and More

Re: How to Create a C# Application to uninstall Applications

pubududilena9-May-05 17:18

pubududilena

9-May-05 17:18

hi,
Yes..it is in the "add/Remove programs" in the Control Panel.But I want to uninstall it from Start-->Programs--->ABC-->uninstall ABC
Menues..
How do we get Uninstall Program for above Menue.?

Thanks in advance..

Re: How to Create a C# Application to uninstall Applications

mav.northwind10-May-05 0:02

mav.northwind

10-May-05 0:02

Hi!
You could simply call msiexec to uninstall your application:
msiexec /uninstall MySetup.msi

There are commandline parameters to make it a silent (un)install and several others.
You can find the documentation here: MSIEXEC docu on MSDN[^]

Regards,
mav

Binding Dataset to DataGridView

Mikan238-May-05 22:29

Mikan23

8-May-05 22:29

I am attemping to bind the data from an xml file into a datagridview. I have achieved this via the following code:

<br />
quotesDataSet.ReadXml(Properties.Settings.Default.XmlQuoteFile);<br />
<br />
quoteGrid.DataSource = quotesDataSet;<br />
quoteGrid.DataMember = "quote";<br />

This automatically binds the four elements of the quote parent into four rows. However, from that point on, I cannot rename the header rows or control them in any way. I've tried everything from attempting to assign a datagridtablestyle, to simply using quoteGrid.Columns[1].HeaderText = "Text"; Can anyone provide me with a working example of how to achieve this?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.