Communication between forms

[Selva Chinnasamy]

I have multiple Mdi Child forms.

Form1 is displaying all the orders list,
Form2 is displaying all the product list.

When I rename a Product name on Form3, I wanted to update contents in Form1
and 2.

Right now the Function renaming the Product is calling
reload functions in Form1 and 2, but its not refreshed.

Thanks In advance for your help.

[VJ]

Re: Communication between forms

You may want to look into the concepts of delegates and events... Its more
like when you click a button, you write code in response to the click, in
the click event. So you will write a delegate/event in Form3 and subscribe
that in Form1 and Form 2, to perform the update in the notification event.
you have to implement this event for your product object... and since
product object is sued in Form 1 and Form 2, you can subscribe to it in the
Form and perform the action on the update event... Codeproject.com or any
vbproject samples websites have simple samples that explain the concept....,
if you google you will get them

VJ

"Selva Chinnasamy" <selvarajuchinn asamy@online.no spam> wrote in message
news:OPR6b0HZGH A.4248@TK2MSFTN GP05.phx.gbl...[color=blue]
>I have multiple Mdi Child forms.
>
> Form1 is displaying all the orders list,
> Form2 is displaying all the product list.
>
> When I rename a Product name on Form3, I wanted to update contents in
> Form1
> and 2.
>
> Right now the Function renaming the Product is calling
> reload functions in Form1 and 2, but its not refreshed.
>
> Thanks In advance for your help.
>
>
>
>
>[/color]

[Linda Liu [MSFT]]

RE: Communication between forms

Hi Selva,
Thank you for posting. From your post, my understanding on this issue is:
how to update contents in Form1 and Form2 when the Product name in Form3
changed. If I'm off base, please feel free to let me know.

You can define an event for the change of the product name and write a
method to trigger the event when the product name changes in Form3. Then
subscribe the event and define corresponding event handling methods in
Form1 and Form2. Thus when the product name in Form3 changes, the event
will be raised and the corresponding event handling methods in Form1 and
Form2 will be called.
The following is a sample.

// event defined in Form3
public delegate void ProductNameChan gedEventHandler (int productID);
public event ProductNameChan gedEventHandler EvtProductNameC hanged;
private void OnProductNameCh anged(int id)
{
if (EvtProductName Changed != null)
{
EvtProductNameC hanged(id);
}
}

// add reference variable of a instance of Form3 ,subscribe the event and
define the handling method
public Form3 frm3 = null;
public Form1()
{
InitializeCompo nent();
frm3.EvtProduct NameChanged += new
Form3.ProductNa meChangedEventH andler(frm3_Evt ProductNameChan ged);
}
void frm3_EvtProduct NameChanged(int productID)
{
// add your update process here
}

You should assign the instance of Form3 to the reference variable "frm3"
of Form1 in the MDI Parent.

Hope this is helpful to you.
Please don't hesitate to tell me if you have any other concerns, or need
anything else.


Sincerely,
Linda Liu
Microsoft Online Community Support

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[Cerebrus]

Re: Communication between forms

Hi Linda,

Thanks for your post. It is helpful to me as well. I'm not that strong
on delegates.

But since this is a VB newsgroup, could you explain how the same thing
would be done in VB.NET ? Would it be as simple as converting the code
to VB.NET ?

Thanks in advance,

Regards,

Cerebrus.

[Linda Liu [MSFT]]

Re: Communication between forms

Hi Cerebrus,

The following is a sample written in VB.NET.
// event defined in Form3
Public Event EvtProductNameC hanged(ByVal productID As Integer)
Private Sub OnProductNameCh anged(ByVal id As Integer)
RaiseEvent EvtProductNameC hanged(id)
End Sub

// add reference variable of a instance of Form3 , define the event
handling method
Public WithEvents frm3 As Form3
Private Sub frm3_EvtProduct NameChanged(ByV al productID As Integer)
Handles frm3.EvtProduct NameChanged
' add your update process here
End Sub

You should assign the instance of Form3 to the reference variable "frm3"
of Form1 in the MDI Parent.
Hope this is helpful to you.

Sincerely,
Linda Liu
Microsoft Online Community Support

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[Cerebrus]

Re: Communication between forms

Thank you Linda, much appreciated.

Regards,

Cerebrus.

[Linda Liu [MSFT]]

Re: Communication between forms

Hi Cerebrus, you're welcome!


Sincerely,
Linda Liu
Microsoft Online Community Support

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[Selva]

Re: Communication between forms

Thanks A Bunch Linda.

Selva

"Linda Liu [MSFT]" wrote:
[color=blue]
> Hi Cerebrus,
>
> The following is a sample written in VB.NET.
> // event defined in Form3
> Public Event EvtProductNameC hanged(ByVal productID As Integer)
> Private Sub OnProductNameCh anged(ByVal id As Integer)
> RaiseEvent EvtProductNameC hanged(id)
> End Sub
>
> // add reference variable of a instance of Form3 , define the event
> handling method
> Public WithEvents frm3 As Form3
> Private Sub frm3_EvtProduct NameChanged(ByV al productID As Integer)
> Handles frm3.EvtProduct NameChanged
> ' add your update process here
> End Sub
>
> You should assign the instance of Form3 to the reference variable "frm3"
> of Form1 in the MDI Parent.
> Hope this is helpful to you.
>
> Sincerely,
> Linda Liu
> Microsoft Online Community Support
>
> =============== =============== =============== =======
> When responding to posts,please "Reply to Group" via
> your newsreader so that others may learn and benefit
> from your issue.
> =============== =============== =============== =======
>
>[/color]

[Linda Liu [MSFT]]

Re: Communication between forms

Hi Selva,

You are welcome!
If you have any other questions or concerns, please don't hesitate to
contact us. It is always our pleasure to be of assistant.

Have a nice day!


Sincerely,
Linda Liu
Microsoft Online Community Support

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