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ActiveForm returns a Form object, not a whateverMyFormName object. So, the Form class doesn't have a method called Add. You have to cast the Form object returned by ActiveForm to the class that it really is. BTW, you don't need to iterate through the MdiChild forms. You ALREADY have the instance of the form that is active!
Dim myForm As YourFormClass = DirectCast(Form.ActiveForm, YourFormClass)
myForm.Add()
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The problem is I don't know what the formclass is
I have for instance 20 open forms and on the active one I need to run the function add()
so I can't cast an object because I don't know wich form it is
any idee's or am I understanding your code wrong
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Then you can create a seperate Interface that each of your child form types Implements. You then cast the ActiveForm to the Interface and call the Add method through that.
Public Interface ISomething
Sub Add()
End Interface
And in your form classes:
Public Class MyChildForm
Implements ISomething
Public Sub Add() Implements ISomething.Add
...
End Sub
...and in your ActiveForm code:
Dim myChildForm As ISomething = DirectCast(Form.ActiveForm, ISomething)
myChildForm.Add()
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I like the interface part since I was planning on using that anyway
but the code doesn't work because 'Form.activeform' is always nothing (and I have a form active)
so I get an error that he cant cast my mdi form (wich doesn't implement the interface) to an interface
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solved the problem
have to use me.activemdichild instead then it works perfectly
thank you for help
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Hey Guys,
this is my first time posting a message here so please forgive me if i am doing some mistake
Major Part :- I am developing a small window application which involves getting a wave file from hard drive and then cutting it into parts and then merging each part with two other wave files
Minor Part :- The wave files are the statements that some people record so it is usual that they would have a pause at the end. so the processing of my application also involves cutting the pause or the part that does not have any sound except some noise
I would greatly appreciate if anyone can even point a method or interface which i can use to do what i require....!
Note :- I have tried using DirectShow but no good results
Amit Patel
apatel@brandinstitute.com
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Hello there
I have build a window service it works fine until i get some task to do. If the task is say a recursive Function it starts using complete resources of the System i-e 100 % CPU Usage . I want my application not to use more then 10 % of CPU at any time.
Any Help ???
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Hi,
AFAIK allocating CPU cycles is not supported, so getting an effective percentage of CPU
power is almost impossible; at best your app could observe its own CPU usage
and include some Thread.Sleep() to compensate when it is too high.
I would suggest though you change your app's priorities.
The simplest approach is, set your app's thread to a priority "below normal" (if
multiple threads, do it for all of them). The advantage is it comes below the normal,
interactive applications (certainly the one that has focus), and it still could
get 100% of CPU power if there is nothing else to do.
A more complex approach, which I do not recommend, is to have a timer, that changes
the app's priority (again one or all threads) between their normal value and a reduced
value, hoping to better match the 10% goal. But that is a lot of hassle (and overhead)
for still an unclear result. And I discourage all attempts to raise priorities
for such purposes, if you suddenly feel your app is not getting enough CPU cycles...
Hope this helps.
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I want to arranges three entered words in alphabetical order.How can i do that? (Using VB.NET)
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put the three words in an list or array and then use the sort methode
Dim l As New List(Of String)<br />
l.Add("atest")<br />
l.Add("ctest")<br />
l.Add("btest")<br />
For Each s As String In l 'just for display perposes<br />
ListBox2.Items.Add(s)'just for display perposes<br />
Next'just for display perposes<br />
l.Sort()<br />
For Each s As String In l'just for display perposes<br />
ListBox3.Items.Add(s)'just for display perposes<br />
Next'just for display perposes<br />
<br />
Dim arr As New ArrayList<br />
arr.Sort()<br />
Dim arrr As Array<br />
arr.Sort()
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hi
is there any way to create a crystal report dynamically with design layout?? or
can i repeat the detail section dynamcially???
Thanx
Jayesh Talsaniya
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If you are looking to dynamically show different detail sections depending on the data returned, the way to do that is to create multiple detail sections, and set the "Suppress" criteria for each section so that under the appropriate condition one detail section is shown and the others are hidden, eg:
Detail 1 Suppress Criteria
TypeID <> 1
Detail 2 Suppress Criteria
TypeID <> 2
Detail 3 Suppress Criteria
TypeID <> 3
Will hide Detail 1 when it's TypeID is not 1, etc.
Will this help in your situation?
D.
-------------------------------------------
Don't walk in front of me, I may not follow;
Don't walk behind me, I may not lead;
Just bugger off and leave me alone!!
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Hi,
I have been trying to make a control derived from System.Windows.Forms.Panel which would allow the use of the opacity property as in the form. I am new to VB.Net, so could anyone please help me as to how this would be possible?
Thanks,
Ahmad
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The panel accepts semi transparent colors, why not have an opacity field and set it to take decimal format from 0.01 to 1 then do this :
me.backcolor = color.fromargb(math.floor(255(opacitypropertyvalue)),me.backcolor.red,me.backcolor.green,me.backcolor.blue)
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This is giving multiple errors. Firstly, the fromargb method takes only one parameter, and secondly it is interpreting 255 as an array name. Is there any way around it?
Thanks
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post your code so we can see it...also this method will only affect the panel's background opacity, not the controls the panel may contain.
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This won't work. It will only work for the entire form. You cannot make individual controls opaque.
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Thanks alot for the help guys! 
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I want to user pdf file format like other word,excel in my vb.net project.
please tell me how can I do this or send me url's for useful site.
Ashish K. Vyas
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Ashish Kumar Vyas wrote: I want to user pdf file format like other word,excel in my vb.net project.
You want to 'user' them?
You want to 'user' them 'like other word,excel in my vb.net project'?
You might want to start by explaining what you want rather than throwing words at the textbox :P
I assume you mean you want to 'use' pdf files in your application. But you don't say how you want to use them. Read? Write? Send to your bosses email address in an infinate loop?
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exactly I want to generate report in pdf format like excel and other file formats.
let me know for read and write pdf aslo....
Thank you....
Ashish K. Vyas
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Hi,
I want to PDF for creating the files that will go as attachments to various users in mine project . To my knowledge VB.Net dosent have in built support for creating PDF files. There are some libraries which can be used to create PDF files but those are licensed version.
If you know some open source PDF libraries or other helpful information, please mail those details. Please explain other formats which can be used to create the files for mine project.
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Hi,
Do you know any open source PDF libraries.
how to write in pdf using vb.net
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the first link I provided is an open source way to create pdf's
for editing an existing one I havn't found any so far. I'v been looking for quite a while now since I could use it aswell but so far all the coude I'v found use the adobe library's and to be able to use them you need the full version
If I find a way I'll let you know but I'm afraid that for the moment I have to assume that it is not possible to do it without bying the full version of adobe (at least not legally possible)
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