Re: VB6 - Property Let, Event and '\' - c# how? - C# Discussion Boards

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Re: MSDE PROBLEM

eggie51-Aug-03 15:17

eggie5

1-Aug-03 15:17

ok, gracias.

/\ |_ E X E GG

Datagrid Collaspe Property

Milancie31-Jul-03 10:02

Milancie

31-Jul-03 10:02

What property controls the initial visible default state of a datagrid in a Windows .Net Form?

My application fills a datagrid during form load from a oledb database query.

When the form is loaded the datagrid is blank except for a cell with a + sign
Once the + is clicked then a second cell is shown containing a link. After the link
is clicked the grid then is filled with the data.

How can I programmatically complete the first two clicks so that when the form is loaded
the user sees a full grid of data instead of having to click on the + and then on the link. Confused | :confused:

Thanks so much

Re: Datagrid Collaspe Property

Ista31-Jul-03 12:25

Ista

31-Jul-03 12:25

try referencing the table instead of the dataset

I'm not an expert yet, but I play one at work. Yeah and here too.

Convert WBMP to BMP?

Bog31-Jul-03 8:36

Bog

31-Jul-03 8:36

I need to convert WBMP (wireless bitmap) into regular bmp (or png or jpg), in my code. Anyone know any library that does that?

thanks

"Outside of a dog, a book is Man’s best friend. And inside of a dog, it’s too dark to read."
-Groucho Marx

UDL File with C#

Jerin31-Jul-03 8:32

Jerin

31-Jul-03 8:32

Hi,
How to get the parameters (connection string etc) from a .udl file through c# code

Thanks in advance

Jerin

Re: UDL File with C#

Mike Dimmick31-Jul-03 13:44

Mike Dimmick

31-Jul-03 13:44

Open the file with a text editor, e.g. Notepad. Here's one I prepared earlier (lines broken for clarity):

  [oledb]
  ; Everything after this line is an OLE DB initstring
  Provider=Microsoft.Jet.OLEDB.4.0;
<font color=#c080c0>+</font> Data Source=C:\Program Files\Microsoft Office\Office\Samples\Northwind.mdb;
<font color=#c080c0>+</font> Persist Security Info=False

As you can see, it's basically just an INI file format. You can find an INI file reader here[^].

VB6 - Property Let, Event and '\' - c# how?

Chua Wen Ching31-Jul-03 7:24

Chua Wen Ching

31-Jul-03 7:24

Hi there.

I had 3 questions to ask.

1)

Public Event ButtonClicked(MessageBoxNumber As Integer, OKButton As Boolean, CancelButton As Boolean, ExitButton As Boolean)

--> how to code this in c#? If not mistaken, if they used the keyword WithEvent i will use delegates and events. But now is the keyword event! Any sample codes base on top?

2)

Public Property Let MessageBoxPrompt(MessageBoxNumber As Integer, ByVal vData As String)
MBox(MessageBoxNumber).Prompt = vData
End Property

MBox is a type of MessageBox

--> oh okay, i know c# got get and set, but there is no let. And can i assign property with arguments like MessageBoxNumber as integer, etc...

3) in vb6, you had in operator '\' for division integer, how can i achieve this in c#?

Any help, please?

Thanks.

Regards,
Chua Wen Ching :p

Re: VB6 - Property Let, Event and '\' - c# how?

J. Dunlap31-Jul-03 8:31

J. Dunlap

31-Jul-03 8:31

Public Event Buttonclicked(MessageBoxNumber As Integer,
       OKButton As Boolean, CancelButton As Boolean, 
       ExitButton As Boolean)

...becomes...

public event ButtonClickedEventHandler ButtonClicked;
protected void OnButtonClicked(ButtonClickedEventArgs args)
{
   if(ButtonClicked!=null)
	ButtonClicked(this,args);
}

To raise the event:

OnButtonClicked(new ButtonClickedEventArgs(messageboxnumber,

Then outside your class, you will need:

public delegate void ButtonClickedEventHandler(object sender, ButtonClickedEventArgs e);
public class ButtonClickedEventArgs : EventArgs
{
   int m_MessageBoxNumber=0;
   bool m_OKButton=false;
   bool m_CancelButton=false;
   bool m_ExitButton=false;
		
   public ButtonClickedEventArgs(int messageboxnumber, 
            bool okbutton,bool cancelbutton,
            bool exitbutton)
   {
      m_MessageBoxNumber=messageboxnumber;
      m_CancelButton=cancelbutton;
      m_OKButton=okbutton;
      m_ExitButton=exitbutton;

   }
		
   public int MessageBoxNumber
   {
      get
      {
	 return m_MessageBoxNumber;
      }
   }
   public bool CancelButton
   {
      get
      {
	 return m_CancelButton;
      }
   }
   public bool OKButton
   {
      get
      {
	 return m_OKButton;
      }
   }
   public bool ExitButton
   {
      get
      {
	 return m_ExitButton;
      }
   }
}

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: VB6 - Property Let, Event and '\' - c# how?

Anonymous31-Jul-03 15:23

Anonymous

31-Jul-03 15:23

Why 1 vb6 short code, in c# i need to code so much?

Any idea?

Regards,
Chua Wen Ching :p

Re: VB6 - Property Let, Event and '\' - c# how?

J. Dunlap31-Jul-03 15:38

J. Dunlap

31-Jul-03 15:38

The C# way of doing it has many advantages, icluding:

* You can assign lots of different events to the same method.
* You can very easily hook and unhook events at runtime.
* The C# event implementation is much more flexible.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: VB6 - Property Let, Event and '\' - c# how?

Anthony_Yio31-Jul-03 16:35

Anthony_Yio

31-Jul-03 16:35

VB is meant for RAD which mean they ignored details for you. Good for general purpose programming, bad for advanced.

Re: VB6 - Property Let, Event and '\' - c# how?

J. Dunlap31-Jul-03 8:39

J. Dunlap

31-Jul-03 8:39

As for question #2:
In C#, a property set is the same as a property let - and that's how things should be.
You cannot pass arguments to a property. You can, however, use indexers or a method.

And question #3:
Try casting the values to integers after performing division on them.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: VB6 - Property Let, Event and '\' - c# how?

Chua Wen Ching31-Jul-03 15:22

Chua Wen Ching

31-Jul-03 15:22

For question 2, i got an error:

This is how i code:

public string SmallWindowPrompt(int SmallWindowNumber, string vData)
{
get
{
return this.SM[SmallWindowNumber];
}
set
{
SM[SmallWindowNumber] = vData;
}
}

When i compile, it says i need to place 2 semicolons right after get and set.

I just change the variable name, but it is based on question 2..

any help?

Thanks for everyone replies.

Regards,
Chua Wen Ching :p

Re: VB6 - Property Let, Event and '\' - c# how?

J. Dunlap31-Jul-03 15:34

J. Dunlap

31-Jul-03 15:34

In C#, properties cannot have arguments. But why not just publicly expose whatever that SM collection is, and therefore eliminate the need for that property?

BTW, here's a tutorial[^] on properties in C#.

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: VB6 - Property Let, Event and '\' - c# how?

Chua Wen Ching31-Jul-03 23:47

Chua Wen Ching

31-Jul-03 23:47

Hi. My English not that good.. what you mean by:

why not just publicly expose whatever that SM collection is

???

Can show me an example?

Regards,
Chua Wen Ching :p

Re: VB6 - Property Let, Event and '\' - c# how?

J. Dunlap1-Aug-03 9:00

J. Dunlap

1-Aug-03 9:00

Make a property for the SM collection.

public type SmallWindows
{
   get
   {
       return SM;
   }
}

"Blessed are the peacemakers, for they shall be called sons of God." - Jesus

"You must be the change you wish to see in the world." - Mahatma Gandhi

Re: VB6 - Property Let, Event and '\' - c# how?

sburton@amersham1-Aug-03 8:18

sburton@amersham

1-Aug-03 8:18

Another way: You can make this an overloaded method or create two properties.

// OVERLOADED METHODS
public string SmallWindowPrompt( int smallWindowNumber ) {

    return this.SM[sallWindowNumber];

}

public void SmallWindowPrompt( int smallWindowNumber, string vData ) {

    SM[smallWindowNumber] = vData;

}

// PROPERTIES
public string GetSmallWindowPrompt {
    get { return this.SM[SmallWindowNumber];}
}

public string SetSmallWindowPrompt {
    set{ this.SM[SmallWindowNumber] = value;}
}

Re: VB6 - Property Let, Event and '\' - c# how?

sburton@amersham31-Jul-03 9:41

sburton@amersham

31-Jul-03 9:41

Question #3

The dividion operator is overloaded to handle both integer and floating-point division.

Search for "Operators Compared in Different Languages" in the Help topics.

cast the results to integer.
float i = 1199282.293F;
float j = 199.33F;

newResult = (int)( i / j );

Using Custom .dll files - where do they go?

mikemilano31-Jul-03 7:07

mikemilano

31-Jul-03 7:07

I have created a .dll file to manage data with an sql server.

I want to build a new windows app that uses that .dll

2 Questions:
1. Where does the .dll file go? In the same directory as my project?

2. When I include the file, is it just like I define other classes?

Using namespace.class;

Re: Using Custom .dll files - where do they go?

Martin Cook31-Jul-03 7:21

Martin Cook

31-Jul-03 7:21

Assuming you are using Visual Studio.NET, open the solution explorer and right click on the "references" folder, select the "Add reference" menu choice, then click the browse button. Browse to your .DLL file, and click "OK". That will add a reference to your .DLL to the project. From there, just add a line at the top of your source file like this:

"using mynamespace;"

Martin Cook
Who needs cyberspace when you have CP space? Smile | :)

Re: Using Custom .dll files - where do they go?

mikemilano31-Jul-03 7:36

mikemilano

31-Jul-03 7:36

Thank you , .. as for .NET classes, they should automatically reference .. is this correct?

I had a problem where I created an app that would not run on another system which didn't have VS.NET installed.

It was an XP Pro box with .NET1.1 installed.

Re: Using Custom .dll files - where do they go?

Rein Hillmann31-Jul-03 22:20

Rein Hillmann

31-Jul-03 22:20

I had a problem where I created an app that would not run on another system which didn't have VS.NET installed.

As long as the target machine has the .NET framework installed, you should be good to go. Ensure that the framework version on the target machine is the same as the one you compiled your application to.

Hiding Form on Startup

Adam Durity31-Jul-03 5:40

Adam Durity

31-Jul-03 5:40

Hey,

How do you hide a form on startup so that it doesn't show at all. I want to hide a form initially until the user clicks on a notifyIcon. Currently...

public Form1()
{
	//
	// Required for Windows Form Designer support
	//
	InitializeComponent();
	this.Hide(); //or this.Visible = false;
}

...does not work. Any suggestions?

-- Adam

"If you can't beat your computer in chess, try kickboxing"

Re: Hiding Form on Startup

JM_FL31-Jul-03 6:27

JM_FL

31-Jul-03 6:27

Hey Adam,

try this, to prevent the form to be created at startup, if the no-button is clicked.

if (MessageBox.Show("Start Application",
"Question",
MessageBoxButtons.YesNo,
MessageBoxIcon.Information) == DialogResult.Yes)
{
Application.Run(new Form1());
}

Maybe it's helpful...

Jörg

Re: Hiding Form on Startup

Ista31-Jul-03 6:57

Ista

31-Jul-03 6:57

why not set a madule main function to be startup rather than a form. then you can do what you want with it

I'm not an expert yet, but I play one at work. Yeah and here too.

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