C# Discussion Boards - CodeProject

2-Sep-09 21:17

Hello...

I m creating ASP Website in C#.

There is one drop down list and one text box

In drop down list, i have country's name.

Problem:

i just want is that textbox will display the selected item in drop down list.
Suppose if i select INDIA in Drop down list then textbox must display INDIA..

Please Help me out.

Thanks in Advance.

Lalit

stancrm2-Sep-09 21:31

stancrm

2-Sep-09 21:31

In C# WinForm use the event SelectedIndexChanged from ComboBox :

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
  textBox1.Text = comboBox1.Text;
}

But in ASP, ask in ASP.NET forum.

lalit142-Sep-09 22:17

2-Sep-09 22:17

I wrote this below code but nothing is working.

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
TextBox1.Text = DropDownList1.Text;
}

lalit142-Sep-09 22:19

2-Sep-09 22:19

above code i hav written in default.aspx.cs file

stancrm2-Sep-09 22:25

stancrm

2-Sep-09 22:25

Have you ever used event handler ??

Do this first ...

comboBox1.SelectedIndexChanged += comboBox1_SelectedIndexChanged;

lalit142-Sep-09 23:53

2-Sep-09 23:53

Hey thanks ...........

I solved my problem.

Nice site, and nice members too.

Once again Thanks

OriginalGriff2-Sep-09 22:26

2-Sep-09 22:26

Yes, but did you hook into the event? Or just write the handler?

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CultureInfo

Rajee Maharjan2-Sep-09 21:12

Rajee Maharjan

2-Sep-09 21:12

Hi,
Please help me who know these answer:

I need to Know the which cultureinfo is used in system.
For example: I need to know my system has which datetime format is used us or uk. To know the datetime format of US or UK. Can any idea in Localization or Globalization

Thanx in advance

Re: CultureInfo

OriginalGriff2-Sep-09 21:19

Ask about <> with class name

2-Sep-09 21:19

Clickity[^]

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Re: CultureInfo

stancrm2-Sep-09 21:33

stancrm

2-Sep-09 21:33

Application.CurrentCulture

Anmar-xe2-Sep-09 20:49

Anmar-xe

2-Sep-09 20:49

hi everyone...i have a basic knowledge of asp.net using vb.net and am working now on a project that use c# classes i get to code where i see someting like this Dictionary<string, PageConfig>...so whats that mean

please allow me to be a good programer

Re: Ask about <> with class name

Arun Jacob2-Sep-09 20:55

Arun Jacob

2-Sep-09 20:55

Anmar-xe wrote:
please allow me to be a good programer

MSDN is the best resource for learning this type of things,
http://msdn.microsoft.com/en-us/library/xfhwa508.aspx[^]
Smile | :)

Arun Jacob
http://codepronet.blogspot.com/

Re: Ask about <> with class name

Anmar-xe2-Sep-09 20:57

Anmar-xe

2-Sep-09 20:57

thank you

please allow me to be a good programer

Weird, unexplained occurance...

MarkB7772-Sep-09 20:48

MarkB777

2-Sep-09 20:48

I've been working on a CRS system, and was running into a nasty error...

For some reason every ~16 or so search queries, the program would crash, and give me a WIN32 exception, telling me that my program had used up all its allocated handles.

Ok, so I wasn't disposing of my objects correctly somewhere...

After much searching, I found that the foreach loop that was disposing of the results was not working as expected. (the search results were displayed using Panels).

If I called:

<br />
int i = window.FlowPanel.Controls.Count;<br />

It would return the expected number of (say) 20.

However when I ran:

<br />
foreach (Control c in window.FlowPanel.Controls)<br />
{<br />
    c.Dispose();<br />
}<br />

It would cut out of the foreach loop at the 10th object.

If I ran the same foreach loop directly afterwards, it would cut out at the 5th object etc etc.

I solved the problem by using this snippet:

<br />
while (window.FlowPanel.Controls.Count > 0)<br />
{<br />
foreach (Control c in window.FlowPanel.Controls)<br />
{<br />
    c.Dispose();<br />
}<br />
}<br />
<br />
GC.Collect();<br />

This solved the problem, but can anyone explain this behaviour?

Cheers,

Mark.

Mark Brock
"We're definitely not going to make a G or a PG version of this. It's not PillowfightCraft." -- Chris Metzen

OriginalGriff2-Sep-09 21:33

2-Sep-09 21:33

It's not that unexplained - Think of it this way: If you have a list and you iterate through it, what happens when you delete one of the list entries? What is the next entry for an entry which has been deleted? What happens when the Controls list is traversed by a different process?

Since foreach does effectively that - calls Controls.Next each time round the loop - it is very understandable that at some point you will have a problem. Normally, you would get a "Collection was modified; enumeration operation may not execute" exception, but I guess Dispose doesn't check that!

Use Controls.Remove to take the controls out of the list, then Dispose them. You will need to need to modify the foreach to a for loop (and I suggest iterating backwards from the last to the first, to make it safer.) You will probably find you can rely on the frame work to do the dispose this way.

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Greg Chelstowski2-Sep-09 21:37

Greg Chelstowski

2-Sep-09 21:37

Damnit, beat me to the punch. Wink | ;)

var question = (_2b || !(_2b));

MarkB7773-Sep-09 1:13

MarkB777

3-Sep-09 1:13

Thanks!

Mark Brock
"We're definitely not going to make a G or a PG version of this. It's not PillowfightCraft." -- Chris Metzen

Greg Chelstowski2-Sep-09 21:36

Greg Chelstowski

2-Sep-09 21:36

You're changing the collection you're iterating through--
So the object you started off with at the beginning of the loop is not the same one at the end.
I'm surprised it even let you do that...
a

for(int x=FlowPanel.Controls.Count-1; x>=0; x--)
{
      FlowPanel.Controls(x).Dispose();
}

should do the trick, I think.

var question = (_2b || !(_2b));

OriginalGriff2-Sep-09 21:40

2-Sep-09 21:40

Sorry about beating you to it - it was just luck - but I still think using Remove from the controls list will be a better solution than Dispose!

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Greg Chelstowski2-Sep-09 21:44

Greg Chelstowski

2-Sep-09 21:44

OriginalGriff wrote:
Remove from the controls list will be a better solution than Dispose!

Agreed, no arguments there. Didn't think it through completely ;>

var question = (_2b || !(_2b));