C# Discussion Boards - CodeProject

tonks8425-Jul-09 6:27

25-Jul-09 6:27

Hi,

I have a bound datagridview which contains three combobox columns. The items in each combobox is databound also but dynamically. Depending on the value of the first combobox, the second and thrid combobox will be bound accordingly. I subscribe to the cellendedit event where I check if the cell is in the first column and then databind the second and third combobox cells accordingly. This works fine. The only problem I have is that when the datagrid view is loaded, as it is databound it is trying to assign the second and third cells of each row values which is not in their respective combobox list as the combobox is not bound. Is there any event available in the datagridview control which will let me check the value just before it is being bound to the datagridview cell. There I can bind the comboboxes before the value get's assigned and I shouldn't get any problems. I tried using the databinding complete but that didn't work.. Any suggestions?

Thanks

Re: databound comboboxes in datagridview.

Omar Akhtar Sheikh25-Jul-09 8:29

Omar Akhtar Sheikh

25-Jul-09 8:29

There is an event named as "Selected Index Changed " used for combo boxes. You should go for that. If that doesn't even solve your problem then contact me again.

Re: databound comboboxes in datagridview.

tonks8425-Jul-09 8:54

tonks84

25-Jul-09 8:54

There is no Selected Index Changed event for the datagridview combobox. Are there any events that occur while databinding is happening?

[Message Deleted]

neha_rai25-Jul-09 5:36

neha_rai

25-Jul-09 5:36

[Message Deleted]

waiting for reply

neha_rai25-Jul-09 9:13

neha_rai

25-Jul-09 9:13

hi..all please give some suggestions if you have on this...

Re: moving points

Henry Minute25-Jul-09 13:20

Henry Minute

25-Jul-09 13:20

To enable clearing your points simply add a call to Invalidate() to the end of your button2_Click() event handler.

private void button2_Click(object sender, EventArgs e)
{
    points.Clear();
    this.Invalidate();
}

Whilst on the subject of painting, for what you are trying to to do you do not need to override the OnPaint() method, simply handle the Paint event of your form.

As far as moving the points is concerned the procedure will be the same as moving any drawing object.

1) Handle the MouseDown event, in it decide if the mouse location (e.Location) is at a point of interest. If so, make a note of the point₁ and then set a boolean flag to true (call the flag something like 'moving' so that its name reminds you of what it's for, and take a note of the current position of the mouse in a class scope field (it will be needed in several places), of type Point, something like this.moveStartPoint = e.Location.

2) Handle the MouseUp event, in it set the flag ('moving') to false, and the moveStartPoint to null and call this.Invalidate()

3) Handle the MouseMove event, in it first check that 'moving' is true (this means that the mouse is still down). If not return. If it is true then set the point that you made a note of in 1)₁ to the new location of the mouse. As you are only moving a point you can set it directly but if you were moving a 'shape' fro example, you would have to use something like

storedPoint.X += (e.X - this.moveStartPoint.X);

Take a look at this[^], for a complete example of moving things you have drawn.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

ToolStrip Overflow button event

satsumatable25-Jul-09 3:40

satsumatable

25-Jul-09 3:40

Hi,

How to handle ToolStrip's Overflow button click event?

Thanks

Re: ToolStrip Overflow button event

satsumatable25-Jul-09 4:01

satsumatable

25-Jul-09 4:01

OK, i found a way...

there is an event called Overflowbutton.click., we have to include this delegate and handle it explicitly

Huge amounts of ListView-Items in ListView. Performance?

JackBeauregard25-Jul-09 2:55

JackBeauregard

25-Jul-09 2:55

Hi there,

I am currently developing a CAN-Monitor (Controller Area Network). The messages
are received event-driven. At the moment the display of the messages is done by a ListView.
In the near future the number of received messages will grow up to ~ 600-800 messages per second.
The messages (encapsulated in a specific object) are delivered to the view via event to a event-handler-method.

Is there a alternative to the ListView which is more performant than the standard-one?

Thanx in advance!

Re: Huge amounts of ListView-Items in ListView. Performance?

Eddy Vluggen25-Jul-09 3:17

Eddy Vluggen

25-Jul-09 3:17

The ListBox, but whatever control you use, as a user I can't read 600/800 messages per second. What's in the message that it needs to be displayed? If there's no specific information, I'd show a label saying (done msg x of y), and only show those who are "interesting" enough.

Re: Huge amounts of ListView-Items in ListView. Performance?

Jimmanuel25-Jul-09 3:20

Jimmanuel

25-Jul-09 3:20

Even if there was such a control, how would a person make sense of a list that was constantly adding messages at an average rate of 700/sec? That sounds like the definition of information overload to me; I'd be more concerned with reducing the amount of information inserted into the list rather than finding a better list control.

Badger | [badger,badger,badger,badger...]

Re: Huge amounts of ListView-Items in ListView. Performance?

Adam Maras25-Jul-09 6:41

Adam Maras

25-Jul-09 6:41

If you absolutely must have a ListView with all of these messages, consider looking into the ListView's virtual mode. It might suit your task a little better.

That solution aside, could you look into using a different user experience that's a little more streamlined for your data?

Adam Maras | Software Developer
Microsoft Certified Professional Developer

Add Properties to user control [modified]

gal00025-Jul-09 2:52

gal000

25-Jul-09 2:52

Hi,
I've created a new user control.

I want to add the property "SelectionColor" to it (like in RichTextBox),
and then i wantto implement the functionality for the property.

Someone have an idea how to do it?

Thanks Smile | :)

modified on Saturday, July 25, 2009 9:22 AM

Re: Add Properties to user control

Henry Minute25-Jul-09 3:06

Henry Minute

25-Jul-09 3:06

What is it that you are not sure of?
How to add a property, or how to implement the functionality for the property once it is added?

DO NOT reply to this post, edit your original to make this clear!

Re: Add Properties to user control

SajjadZare25-Jul-09 9:14

SajjadZare

25-Jul-09 9:14

you should write code like this code in user control
this code use for datagridview "RowHeaderVisible" property

public bool RowHeaderVisibl
{
get
{
return rowHeaderVisiblee;
}//get
set
{
rowHeaderVisiblee = value;
dataGridView1.RowHeadersVisible = rowHeaderVisiblee;
}//set
}//RowHeaderVisibl

how to keep track the browser.

msgreat25-Jul-09 2:03

msgreat

25-Jul-09 2:03

I want to create a c# win form app. It should just display a message box, whenever I am opening Iexplorer.exe. How to do this friends?

GpuCV ?

Mohammad Dayyan25-Jul-09 1:09

Mohammad Dayyan

25-Jul-09 1:09

Hi guys.

Could we use GpuCV[^] in C# ?

Thanks.

Re: GpuCV ?

Henry Minute25-Jul-09 3:09

Henry Minute

25-Jul-09 3:09

Theoretically, yes, if they publish an API. Do I know of a library that does this? No, but Google works as well for you as it does for me.

Re: GpuCV ?

Mike Hankey25-Jul-09 3:54

Mike Hankey

25-Jul-09 3:54

go here[^]

Probably not for C# but could always write your own wrappers?

Mike

"It doesn't matter how big a ranch ya' own, or how many cows ya' brand, the size of your funeral is still gonna depend on the weather." -Harry Truman.

Semper Fi
http://www.hq4thmarinescomm.com[^]
My Site

Reading from Microsoft FingerPrint

SimpleData25-Jul-09 1:08

SimpleData

25-Jul-09 1:08

Hi Is there any way that I can create an unique id from the fingerprint which is scanned by a Microsoft FingerPrint Reader?

Thanks.

Re: Reading from Microsoft FingerPrint

Harvey Saayman25-Jul-09 1:30

Harvey Saayman

25-Jul-09 1:30

Click[^]

Harvey Saayman - South Africa
Software Developer
.Net, C#, SQL
you.suck = (you.Occupation == jobTitles.Programmer && you.Passion != Programming)
1000100 1101111 1100101 1110011 100000 1110100 1101000 1101001 1110011 100000 1101101 1100101 1100001 1101110 100000 1101001 1101101 100000 1100001 100000 1100111 1100101 1100101 1101011 111111

Object reference not set to an instance of an object.

svt gdwl25-Jul-09 0:57

svt gdwl

25-Jul-09 0:57

I had a BHO.
When a web page is opened on IE, I try to replace the HTMLElement's text using

 foreach (IHTMLElement HtmlElemen in (IHTMLElementCollection)document.body.all)
{
try
{
HtmlElemen.GetType().GetProperty("innerText").SetValue(HtmlElemen, "NewText", null);
}
catch(Exception e)
{
 System.Windows.Forms.MessageBox.Show("Message:" + e.Message );
}
}

In some PC's the html element's text is replaced successfully with "Newtext",
but in some PC's it is not replacing.

And an exception message is obtained "Object reference not set to an instance of an object. "

How to fix this exception?

This is built in vs2005 c#.

The exception is obtained only in the PC's which doesn't have VisualStudio2005 or Vs2008.

Are there any dependencies missing for execution of these code.
In my installation Setup, I already added "Microsoft.Mshtml.dll" also.

Still this exception is coming. How can I avoid this exception and make it execute succesfully in all PC's?

Re: Object reference not set to an instance of an object.

Henry Minute25-Jul-09 3:12

Henry Minute

25-Jul-09 3:12

What Framework versions are installed on the PCs that fail?

The Module Dll1.dll was loaded but the entry point DllRegisterserver was not found

Anubhava Dimri24-Jul-09 22:31

Anubhava Dimri

24-Jul-09 22:31

Hi All,
I was create a Dll by using c# it works correctly with application. i want to register it's but regsvr command generate error .

error is given below.
The Module Dll1.dll was loaded but the entry point DllRegisterserver was not found.

Make sure that Dll1.dll is a valid Dll or OCX File and then try again.

so what is the problem behind it.

Thanks in advance

If you can think then I Can.

Re: The Module Dll1.dll was loaded but the entry point DllRegisterserver was not found

lanzolix1118-Aug-09 9:33

lanzolix11

18-Aug-09 9:33

I have the same error with a my dll. I am using VS2005.

Have you find anything?

Thanks

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