Re: ComboBox problem after MessageBox displayed - C# Discussion Boards

Re: ControlBox Close Button

27-Apr-06 3:25

If you can override the ToString() method of the object or create a new readonly property which can serve as a display member.

An alternative would be to handle the OnDrawItem event to draw the string as you want it.

In short: there is no magic property which can do it for you.

You know you're a Land Rover owner when the best route from point A to point B is through the mud.

Ed

ControlBox Close Button

paas27-Apr-06 1:01

paas

27-Apr-06 1:01

I'm developing some MDI applications using VS 2005. I'm wondering if anyone knows of a way I can prevent control validation events from firing if the user clicks on the controlbox close button to exit an MDI child form? Or, as an alternative, if there is a programmatic way to capture the clicking of the controlbox close button before any validation events have fired? I do not want to set CausesValidation on all of the controls to false, and I would prefer to not disable the controlbox close button.

Thank you...

Shajeel27-Apr-06 1:58

Shajeel

27-Apr-06 1:58

to catch form close event use Closing Event

private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if(CanClose == true)
e.Cancel = false; //when this is set to false form closes
else
e.Cancel = true; // when this is set form does not close
}

Shajeel

Re: ControlBox Close Button

paas27-Apr-06 4:27

paas

27-Apr-06 4:27

Thanks but I have no problem with catching the form close event, what I would like to do is prevent validation events from being fired when a user clicks on the Control Box close button. By the time the FormClosing event is triggered, the validation events have already happened and I want to avoid that when the ControlBox close is clicked. As an alternative if there is a way to catch the event/message that the user is clicking on the controlbox close button, that too would help me with some validation issues.

Re: ControlBox Close Button

Shajeel27-Apr-06 20:47

Shajeel

27-Apr-06 20:47

follow the link code is not given but it tells you which messages to catch.

http://www.dotnet247.com/247reference/msgs/7/35820.aspx

Shajeel

ComboBox problem after MessageBox displayed

joaoafonso27-Apr-06 0:23

joaoafonso

27-Apr-06 0:23

Hi everyone.

I'm developing a Windows Forms MDI application with several forms and user controls inside these forms. In some Error situations the user controls display a MessageBox with some text to the user, indicating the error.

The problem in showing these messages is that after I exit the messageBox window and go back to the application window, some of the ComboBoxes on the user control stop working. They just don't respond to any event, like SelectedIndexChanged for ex.

Any clues? Thanks in advance.

The messageBox display is done like this:

try
{
    //code to treat user's choice
}
catch(Exception ex)
{
    MessageBox.Show(null, ex.Message, "Data Error");
}

and i've also tried (with this refering to the user control):

MessageBox.Show(this, ex.Message, "Data Error");

Ed.Poore27-Apr-06 1:41

27-Apr-06 1:41

You need to be a bit more specific about

joaoafonso wrote:
//code to treat user's choice

I'm guessing that you need to revert the combobox back to it's previous or default value, you're probably leaving it with an erraneous value.

(I'm just guessing mind)

You know you're a Land Rover owner when the best route from point A to point B is through the mud.

Ed

joaoafonso27-Apr-06 2:00

joaoafonso

27-Apr-06 2:00

ok, maybe I need to be more specific...

The code tag where I said the user's choice was treated, isn't called when the selectedIndex on the comboBox changes. Instead there is a Button on the User Control to save some info users enter on several textBoxes, and in case there's an error/exception the MessageBox is displayed in the catch{}.

In some cases the combobox retains its values, I can chose them but the selectedIndexChanged event isn't fired. In other cases the comboBox stops working and doesn't open when I click the drop-down arrow. If I don't display any MessageBox the problem never occurs. Happens only after a messageBox is displayed.

Maybe something happens when the MessageBox closes? Is there some event that is fired? Anyone knows what happens to a messageBox object after the window closes?

Ed.Poore27-Apr-06 3:16

27-Apr-06 3:16

Hmm, if the MessageBox.Show is the only code in the catch block then it's puzzling to say the least. Is there a way that you can check the values without having to check for an exception.

For example rather than doing (this is just an example mind):

try
{
	MessageBox.Show(this.listBox.Items[0].ToString());
}
catch (Exception e)
{
	MessageBox.Show(e.ToString());
}

Which would display an error if there is no item at index 0.

Check first:

if (this.listBox.Items[0] == null)
{
	MessageBox.Show(@"No item at index 0");
}
else
{
	MessageBox.Show(this.listBox.Items[0].ToString());
}

Is that possible, can you validate the combo-box rather than wait for the code to fail?

You know you're a Land Rover owner when the best route from point A to point B is through the mud.

Ed

joaoafonso27-Apr-06 6:00

joaoafonso

27-Apr-06 6:00

It didn't work either... Does exactly the same as when I catch the exception. I still think there's something happening when the MessageBox is closed, some value being passed to the parent form, or even the MDI form (the parent form's parent), but I'm just guessing now Laugh | :laugh:

I've decided to build a form to display the error messages instead of the messageBox, since I have no clue as to why this happens.

This is really really weird. Maybe later if I have enough time, I'll try to reproduce this on a new MdiForm and put it here for anyone interested in testing it.

Thanks a lot for your help Ed! Smile | :)

I'll be posting any developments I have on this...

Ed.Poore27-Apr-06 6:02

How can i use a masked textbox column in a datagridview for date format

27-Apr-06 6:02

I've had a look through the MessageBox.Show code in Reflector and there doesn't seem to be anything obnoxious there. Maybe if I had more to play with I could solve it but get your coding done first, thats the main priority, then we can tackle MS Laugh | :laugh:

You know you're a Land Rover owner when the best route from point A to point B is through the mud.

Ed

Lee ju26-Apr-06 23:57

Lee ju

26-Apr-06 23:57

How can i use a masked textbox column in a datagridview for date
================================================================

I am working with Visual studio 2005 and c# 2005.

I have a datagridview which contains a date column and will accept value as 26-04-2006.Initially value will be 00-00-0000.When we press any key it will check value which we entered is number or not.if it is number then it will check for other conditions like

1 the day is greater 32 or not?
2 the month is greater than 12 or not?
3 the year is greater than 2006 or not?..like that.

we have to find in keypress event and cancel each character if it fails.

when we do backspace each value must changed to zeros..

I used masked textbox in datgridview for this but i am facing so many issues for that..

When we editing it will not work properly..the values are getting overlapped with the grid contents and all..i created the masked textbox dynamically in editcontrolshowing event..

if anybody did the same pls help me it is very urgent..

If you have any other solution that are also welcome

thanks in advance,

lee ju

Embedding two forms

praveenqwe26-Apr-06 23:50

praveenqwe

26-Apr-06 23:50

hello guys,
iam a c# beginner can any one help me how to emmbedd two forms into

a single form.
tahnkyou in advance

Re: Embedding two forms

Guffa27-Apr-06 1:13

Guffa

27-Apr-06 1:13

How do you mean?

---
b { font-weight: normal; }

sqlconnection :S :S

Greeky26-Apr-06 23:50

Greeky

26-Apr-06 23:50

When i use oledb.oledbconnection,i connect to SQL Server with this connection string :Provider=SQLOLEDB.1; Persist Security Info=False;User ID=sa;Initial Catalog=MDLABS;Data Source=SQL;

But when i use sqlclient sql connection , i cannot connect to sql server.
my sqlclient connection string is
Persist Security Info=False;User ID=sa;Initial Catalog=MDLABS;Data Source=SQL;

What is missing?

J4amieC27-Apr-06 0:10

J4amieC

27-Apr-06 0:10

Providing the error you get may go some way to helping people answer your question.

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Greeky27-Apr-06 0:44

Greeky

27-Apr-06 0:44

ex.message = Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

J4amieC27-Apr-06 1:12

J4amieC

27-Apr-06 1:12

pretty straightforward error message don't you think? A timout implies that the connection worked fine, but timed out on whatever operation you asked of it!

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xacc.ide-0.1.3.9 - Now with Language Designer

leppie27-Apr-06 4:33

leppie

27-Apr-06 4:33

J4amieC wrote:
A timout implies that the connection worked fine, but timed out on whatever operation you asked of it!

Unless it was a connection timeout Poke tongue | ;-P

J4amieC27-Apr-06 4:39

J4amieC

27-Apr-06 4:39

Even if it was, that error message implies that the connection string was correct in syntax, but that the connection or operation timed out. I should have been more specific.

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Greeky27-Apr-06 8:25

Greeky

27-Apr-06 8:25

"An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. "

how to configure server for remote connections

-- modified at 14:55 Thursday 27th April, 2006