C# Discussion Boards - CodeProject

David Skelly1-Dec-09 4:34

1-Dec-09 4:34

At the top of the page you will see a box labelled Search. Type single instance into this box. Select Articles / Quick Answers in the dropdown next to it. Click the Go! button.

Re: How to make single instance?

RanaSohail1-Dec-09 5:20

RanaSohail

1-Dec-09 5:20

Thanks you all Smile | :)

Message Closed

1-Dec-09 4:36

stancrm

1-Dec-09 4:36

Message Closed

modified 23-Nov-14 6:58am.

Re: How to make single instance?

RanaSohail1-Dec-09 5:15

RanaSohail

1-Dec-09 5:15

Don't point out or raise comments on anyone like that. This question is not just learning for me it can save any other person's time. you are not a child my dear.

Re: How to make single instance?

Shameel1-Dec-09 6:34

Shameel

1-Dec-09 6:34

Sohial A Rana wrote:
you are not a child my dear.

But it seems you are a child asking others to search for you.

Re: How to make single instance?

RanaSohail1-Dec-09 5:18

RanaSohail

1-Dec-09 5:18

i know every type of problem can be solved via search engine. if every problem solve by searching then why people raise questions here?

Re: How to make single instance?

J4amieC1-Dec-09 5:51

J4amieC

1-Dec-09 5:51

Sohial A Rana wrote:
i know every type of problem can be solved via search engine. if every problem solve by searching then why people raise questions here

Re: How to make single instance?

Shameel1-Dec-09 6:37

Shameel

1-Dec-09 6:37

Sohial A Rana wrote:
i know every type of problem can be solved via search engine. if every problem solve by searching then why people raise questions here?

People come here only if they do not find the information through search engines. Google gave me 1,76,000 results for "C# Single instance", the top two of which are CP articles. If you had even tried this, you wouldn't have posted this question here.

Re: How to make single instance?

Shameel1-Dec-09 6:29

Shameel

1-Dec-09 6:29

Do you have trouble clicking the Search button ?

Re: How to make single instance?

vtchris-peterson1-Dec-09 7:09

vtchris-peterson

1-Dec-09 7:09

This problem sent me on various run arounds... the best solution (by far) that I found was:
http://dotnetperls.com/single-instance-windows-form[^]

Re: How to make single instance?

RanaSohail1-Dec-09 16:05

RanaSohail

1-Dec-09 16:05

I have done it. Thanks for all Smile | :)

Re: How to make single instance?

Cracked-Down1-Dec-09 7:23

Cracked-Down

1-Dec-09 7:23

Try using Mutex for inter process communication it is best and as easy as needs only 3 lines of code

Smile | :)

Re: How to make single instance?

joelwms1-Dec-09 11:17

joelwms

1-Dec-09 11:17

This article (A Single Instance Application which Minimizes to the System Tray when Closed) has information on making single instance forms in C# using mutex.

object reference not set to instance of an object

uglyeyes1-Dec-09 2:07

uglyeyes

1-Dec-09 2:07

Hi!

I am getting this error when I try to assign a value to a class property called country that is in a class called advert

advert class

public class Advert
{
private Country _country;
  public Country Country
        {
            get { return _country; }
            set { _country = value; }
        }
}

country class
public class Country
    {
        private string _CountryName;
        private string _UrlSafeCountryName;
        private string _CountryCode;

        public Country()
        {
            this.CountryName = "";
            this.CountryCode = "";
            this.UrlSafeCountryName = "";
        }
        

        public string CountryName
        {
            get 
            {
                return _CountryName;
            }
            set
            {
                _CountryName = value;
            }
        }
        
        public string UrlSafeCountryName
        {
            get
            {
                return _UrlSafeCountryName;
            }
            set
            {
                _UrlSafeCountryName = value;
            }
        }

        public string CountryCode
        {
            get
            {
                return _CountryCode;
            }
            set
            {
                _CountryCode = value;
            }
        }
    }

in my DAL where i get error

advert.Country.CountryName = (string)oReader["CountryName"];

not sure if i am doing it correctly? please help

Message Closed

1-Dec-09 2:09

stancrm

1-Dec-09 2:09

Message Closed

modified 23-Nov-14 6:58am.

Re: object reference not set to instance of an object

S. Brozius1-Dec-09 2:16

S. Brozius

1-Dec-09 2:16

and possibly first instantiate advert also (advert = new Advert())

Nah... What's up, Doc?
CCC's solved : 1

Re: object reference not set to instance of an object

Ravi Sant14-Apr-11 1:52

Ravi Sant

14-Apr-11 1:52

private Country _country = new Country();

should solve your issue!

♫ 99 little bugs in the code,
99 bugs in the code
We fix a bug, compile it again
101 little bugs in the code ♫

Use sendkeys() for google chrome

krinaljariwala1-Dec-09 0:44

krinaljariwala

1-Dec-09 0:44

Hello,
i want to open google chrome and then i want to pass keyword say "Codeproject.com".
I have used process class to open chrome, but how do i use sendkeys() to it.

//google search
            Process newprocess = new Process();
            newprocess.StartInfo.FileName = "chrome.exe";
            newprocess.StartInfo.Arguments = "www.google.com";
            newprocess.Start();
            SetForegroundWindow(newprocess.MainWindowHandle);
            SendKeys.SendWait("CodeProject.com");

Please help me its urgent.
Thank you in advance.

Re: Use sendkeys() for google chrome

Ashfield1-Dec-09 2:18

Ashfield

1-Dec-09 2:18

krinaljariwala wrote:
Please help me its urgent.

Not here it isn't.

Have you tried going to google, put your search in and clicking the search button? It puts your search in the url, and you could do the same rather than trying to use the very dodgy method of sendkeys.

Bob
Ashfield Consultants Ltd
Proud to be a 2009 Code Project MVP

Import old DLL to C# .Net

Reza Shojaee1-Dec-09 0:11

Reza Shojaee

1-Dec-09 0:11

Hi everybody

I have old dll(s) that implemented with Visual Basic 6.0 and Borland Delphi 6.0 and Visual C++ 6.0
I haven't the source of these dlls, So I want to know how can import these dll to C# .Net as a reference.

Best Regards,
Reza Shojaee

Re: Import old DLL to C# .Net

Calla1-Dec-09 0:20

Calla

1-Dec-09 0:20

If it's a COM component you can just add it from the COM tab and let VS create the Interop.

Re: Import old DLL to C# .Net

Reza Shojaee1-Dec-09 0:26

Reza Shojaee

1-Dec-09 0:26

I tried with COM tab but VS doesn't accept it

Best Regards,
Reza Shojaee

Re: Import old DLL to C# .Net

Vimalsoft(Pty) Ltd1-Dec-09 3:48

Vimalsoft(Pty) Ltd

1-Dec-09 3:48

Do you receive some sort or Error ?

Vuyiswa Maseko,

Spoted in Daniweb-- Sorry to rant. I hate websites. They are just wierd. They don't behave like normal code.

C#/VB.NET/ASP.NET/SQL7/2000/2005/2008
http://www.vuyiswamaseko.com
vuyiswa@its.co.za
http://www.itsabacus.co.za/itsabacus/

Re: Import old DLL to C# .Net

Dave Kreskowiak1-Dec-09 4:33

Dave Kreskowiak

1-Dec-09 4:33

Then it's not a COM-based .DLL. You'll have to use P/Invoke to get at the functions it exposes. I hope you have all the documentation on the functions because, if you don't, you're going to find it nearly impossible to call the functions in the .DLL.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008
But no longer in 2009...

Re: Import old DLL to C# .Net

puromtec11-Dec-09 5:25

puromtec1

1-Dec-09 5:25

You need to look up interop services. You can use tlbimp.exe to generate your interop if it is COM (which from the post above seems not to be the case). Otherwise, you can use the DLLImport attribute and reference the functions this way. You will find it tricky to figure out the proper types to use in the function signature, so you need to research a little. But, this is your start.

[DllImport("TheCplusplus.dll")]
static extern uint BTSeparateItems([In, MarshalAs(UnmanagedType.BStr)] string filePath, out object obj);

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