C#

Paul Conrad29-Dec-06 14:08

Paul Conrad

29-Dec-06 14:08

Vasildb wrote:
How to convert a Decimal number to Binary and Binary to Decimal

Take a look at this article: http://www.codeproject.com/cs/library/Convert.asp[^]

CodeItWell29-Dec-06 22:27

CodeItWell

29-Dec-06 22:27

That project doesn't work because I have Visual Studio 2003.
Help.

Vasildb

Luc Pattyn30-Dec-06 2:26

Luc Pattyn

30-Dec-06 2:26

It wouldnt be hard to make the project work on a more recent .NET/Visual Studio version.
Anyway, you do not actually need the project, just look in the code on how they do
conversions...

Smile | :)

Luc Pattyn

CodeItWell30-Dec-06 3:27

CodeItWell

30-Dec-06 3:27

I can't understand that, I a newbie.
Please tell me something easy for understanding.

Vasildb

User 665830-Dec-06 3:41

User 6658

30-Dec-06 3:41

http://www.is.wayne.edu/olmt/binary/page3.htm

Take a look at this site, it covers the conversion algorithm. It's really simple.
Just remember that binary numbers are powers of two, like that:

1101 = 13

read the binary number from right to left:

2 ^ 0 + | 1
0 ^ 1 + | 0
2 ^ 2 + | 4
2 ^ 3 | 8
_______
13

regards

modified 12-Sep-18 21:01pm.

Paul Conrad30-Dec-06 5:44

Paul Conrad

30-Dec-06 5:44

Vasildb wrote:
That project doesn't work because I have Visual Studio 2003

You should have mentioned it in your original post. Look at the code and get a general idea how to do the conversions or bump up to VS 2005...

Forcing a C# form Datagrid to repaint

Martin#24-Jan-07 10:40

Martin#

24-Jan-07 10:40

Hope it's not too late!

private static Int32 BinStringToInt32(string value)
{
    return Convert.ToInt32(value,2);
}


private static string Int32ToBinString(Int32 value)
{
    return Convert.ToString(value,2).PadLeft(32,'0');
}

All the best,

Martin

Vernware29-Dec-06 9:43

Vernware

29-Dec-06 9:43

I am working in C#.net and have a Datagrid control. The grid seems to work ok except for a new problem I have noticed.

When I resize the main form (and consequently the Datagrid) and scroll around the Datagrid using the forms scroll bars and then maximize the form and the Datagrid I notice that the Datagrid does not seem to repaint properly. The entire grid design is messed up.

I suspect this may be a repaint problem. Somehow and somewhere I need to force the grid to repaint.

I would appreciate any tips as to how and where I should do this.

Thanks, Vern

Vern

Re: Forcing a C# form Datagrid to repaint

axos8830-Dec-06 1:04

axos88

30-Dec-06 1:04

I can't really understand what your problem is, maybe you should be a little more clear on when the datagrid does not repaint itself correctly. As for HOW you can repaint it, datagrid.Invalidate(); should do the trick

Regards,
Vandra Akos

Re: Forcing a C# form Datagrid to repaint

Vernware30-Dec-06 4:22

Vernware

30-Dec-06 4:22

Vandra:

Thanks for the tip about the datagrid.Validate(). I put this in the Scroll event of the datagrid and this solved the problem I was having.

Let me try to explain the problem I was having again:
First I resize the datagrid so that the scroll bars show up. Then I scroll around the datagrid. Finally I resize the Datagrid so that it fills the screen. Now when I scroll again, the grid is messed up. Some columns appear twice, some don’t appear at all, its just really messed up.

Anyway, when I put the Datagrid.Invalidate() in the Scroll event, all is well.

Thanks again for your help.

Vern

Vern

assigning location of object

dsl/fahk29-Dec-06 9:39

dsl/fahk

29-Dec-06 9:39

i am trying to move a panel with:

pnlProgressBar.Location.X = pnlProgressBar.Location.X + 1;

for a progress bar. It is inside a while loop, but the following error occurs: "Cannot modify the return value of 'System.Windows.Control.Location' because it is not a variable"

I want it to later be able to actually show the amount of progress it has actually made, but first i need it to be able to move. If anybody else has a better way of making a progress bar that is only one bar, unlike the built in progress bar, please tell me. thanks in advance.

Re: assigning location of object

Colin Angus Mackay29-Dec-06 9:44

Colin Angus Mackay

29-Dec-06 9:44

dsl/fahk wrote:
Cannot modify the return value of 'System.Windows.Control.Location' because it is not a variable"

Location returns a Point structure. Point is immutable meaning once it has been created it cannot be changed. You have to assign a new Point to the Location property of the control.

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"Background Printing"

Beringer29-Dec-06 9:12

Beringer

29-Dec-06 9:12

Hello,

I would like to do what I call background printing. What this means is the user clicks a print button or a link to print a document without acutally having the document visible. I have searched the site for this and haven't found a posting covering this.

The only way I could think to make this happen would be to load the document in a hidden control and print from there. This seems kind of clunky and I was wondering if there was a more elegant approach.

Thanks in advance,
Eric

Re: "Background Printing"

Mircea Puiu29-Dec-06 23:16

Mircea Puiu

29-Dec-06 23:16

Of course there is Laugh | :laugh:

Try to use the BackgroundWorker class.
See more at http://msdn2.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx[^]

SkyWalker

Foreach loop

JMichael246829-Dec-06 7:15

29-Dec-06 7:15

Why does this code give this error: "Specified cast is not valid"?

<br />
foreach(RadioButton r_button in groupBox2.Controls)<br />
{<br />
     Console.WriteLine(r_button.Name.ToString());<br />
}<br />

PIEBALDconsult29-Dec-06 7:22

PIEBALDconsult

29-Dec-06 7:22

Maybe you have something other than a RadioButton in groupBox2?

If so, try

foreach ( Control control in ... )
{
if ( control is RadioButton ) ...
}

JMichael246829-Dec-06 7:44

29-Dec-06 7:44

Thanks!

This worked great!

<br />
RadioButton r_button = null;<br />
<br />
foreach(Control control in groupBox2.Controls)<br />
{<br />
	if ( control is RadioButton )<br />
	{<br />
		r_button = ((RadioButton)control);<br />
		Console.WriteLine(r_button.Text.ToString());<br />
	}<br />
} <br />

Re: Foreach loop [modified]

PIEBALDconsult29-Dec-06 7:50

PIEBALDconsult

29-Dec-06 7:50

Yep, thought it would.

Judah Gabriel Himango29-Dec-06 8:54

Judah Gabriel Himango

29-Dec-06 8:54

Here's a more concise version that also performs better:

foreach(Control control in groupBox2.Controls)
{
   RadioButton radioButtonControl = control as RadioButton;
   if(radioButtonControl != null)
   {
      r_button = radioButton;
   }
}

Last modified: 1hr 8mins after originally posted -- oops, meant to say != null there, thanks colin

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JMichael246829-Dec-06 9:10

29-Dec-06 9:10

The following line errors out.

<br />
RadioButton radioButtonControl = control as RadioButtonControl;<br />

I changed "RadioButtonControl" to RadioButton, but the if statement gives the following error.

Cannot implicitly convert type 'System.Type' to 'bool'

Colin Angus Mackay29-Dec-06 9:13

Colin Angus Mackay

29-Dec-06 9:13

The if statement must evaluate to a boolean. The code you were given shows a mistake many developers that code in both C++ and C# make.

if (radioButtonControl != null)...

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JMichael246829-Dec-06 9:23

29-Dec-06 9:23

I don't know why I didn't know that, I use that all the time!