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Hi guys, I need your help in preventing multiple instances of the same window from opening in an MDI parent child window application ? Its urgent ...thanks ...
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What is the question, where are you stuck?
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My question is simple and straight..I want to prevent multiple instances of the same child window from opening i.e. only one instance of a window should open up when i select a certain menu option from the main menu. I hope i made myself clear this time..!!
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One way can be:
use frm.ShowDialog();
This way, unless you have not closed the current child form, you cannot open anyother.
This might be a quick fix for your problem. If you don't want this you might have to google intensly 
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yeah..I have tried that approach, but as u say, i was not able to to open up any other window until i closed this one..but tht should not happen in an MDI windows application ..right ?
Can Dispose() method help in this case?
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yeah..I have tried that approach, but as u say, i was not able to to open up any other window until i closed this one..but tht should not happen in an MDI windows application ..right ?
Can Dispose() method help in this case?
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MDI Parent forms contain a collection of it's children (this.MdiChildren). Before you open a new instance of a form you could check this collection if your form exist and simply activate this instance.
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Can you elaborate a bit more...thanks
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I found the solutions mate:
Form2 frm = new Form2();
if (MdiChildren.Length != 0)
{
for (int i = 0; i < this.MdiChildren.Length; i++)
{
if (this.MdiChildren[i].GetType().Name != "Form2")
{
frm.Show();
frm.MdiParent = this;
}
}
}
else
{
frm.Show();
frm.MdiParent = this;
}
PS: you will have to modify this the above is real quick and dirty.
You will have to check this for each and every form you open.
Cheers.
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Can you fire an event inside of an event that is already executing?
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Is there anything special you have to do to get this to work because the event inside the executing event is not firing?
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It is possible that you are not firing the event properly, can you pass me the code.
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This is the code:
protected void btnNext_Clicked(object sender, EventArgs e)
{
switch (m_teststage)
{
case "STEP1":
hidMode.Value = "STEP2";
break;
case "STEP2":
hidMode.Value = "STEP3";
break;
}
m_teststage = hidMode.Value;
FormatPageChange();
}
private void FormatPageChange()
{
if (m_teststage == "STEP2") InitialiseDMRGrid();
if (m_teststage == "STEP3") InitialiseTestGrid();
SetPanelVisibility();
SetButtonVisibility();
SetValidatorsEnabled();
}
private void InitialiseDMRGrid()
{
WebGridHelper m_webgridhelperDMR = new WebGridHelper(wgDMR, "", "ID");
wgDMR.PrepareDataBinding += new DataSourceEventHandler(wgDMR_PrepareDataBinding);
wgDMR.InitializeDataSource += new DataSourceEventHandler(wgDMR_InitializeDataSource);
m_webgridhelperDMR.SortColumns += new SortColumnsEventHandler(m_webgridhelperDMR_SortColumns);
wgDMR.InitializePostBack += new PostBackEventHandler(wgDMR_InitializePostBack);
}
If I click the Next button the event fires but when it gets to the InitialiseDMRGrid method it goes in but does not fire the events inside.
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I think the problem is:
You are "adding" the events on button click and not "firing" them. They will fire when they are suppose to fire.
Your code will add the events to, for eg:
wgDMR.InitializeDataSource += new DataSourceEventHandler(wgDMR_InitializeDataSource);
and when the DataSource in initialised then this event will fire. (I guess you have defined the event handlers somewhere else, because I can't see the event handlers for any of the above events.)
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I see what I am doing wrong now. Thanks for your help.
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This is not good approach by firing an event inside the already firing event.
Regards,
Satips. ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
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Why not?
only two letters away from being an asset
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Satips wrote: This is not good approach by firing an event inside the already firing event.
WHY ?
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hello every body.
is there any method to write a matlab code within c#?
Please help.
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There is an Article by Emanuele Ruffaldi Here[^] in CP.
Hope it will help you.
Regards,
Satips.
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Hi
Can anyone help me with some function I can use to help me get the mouse over coord in a logical window.
samuel
Programming helps one to forget the world around them
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Hey Experts
I have used a lot of time finding the best solution on how to build a widget, like the one from Yahoo widget engine in C#.
The problem is the transparent look, where for example the background can be round and with a drop shadow. I have tried a few tutorial, but they result in a lot of aliasing.
The result i would like is like the picture on the following link:
http://widgets.yahoo.com/gallery/view.php?widget=40459[^]
I totally new to C#, but can I already loves it, so I hope somebody can produce me a little sample application.
I hope somebody can help me
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Not sure what you want here - to create web controls, windows controls, or what ? I presume you have a background in other programming languages ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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No I just want to transform the widget to C#-language instead of using the widget engine. I have just made a background with dropshadow in photoshop. I want this no be the background and on top i will place some windows komponents. I have uploaded the picture on http://www.control.aau.dk/~ksno04-nobackup/background.png[^]
Was that a bit more clear?
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