passing variable between forms

[Sameh Ahmed]

Hello there
I know that if I have more than one form in the same project I will have to
create variables of any form I need to use.
I manage to open forms using the show(), now what I need to do is to set the
value of a control's property on the calling form.
As I can do that from the calling form to any control on the instance of
form2, how do I do the contrary?
Example:
I have form1, it contains a text box and a button.
I click on the button and an instance of form2 shows up.
I have a button on form2, I click on this button, and the text property of
the text box on form1 changes.
Any ideas on how do I do that?

[Supra]

on form2 button event
form1.texbox1.text=( i don't know what inside buuton on form2)

regards,

Sameh Ahmed wrote:

Hello there
I know that if I have more than one form in the same project I will have to
create variables of any form I need to use.
I manage to open forms using the show(), now what I need to do is to set the
value of a control's property on the calling form.
As I can do that from the calling form to any control on the instance of
form2, how do I do the contrary?
Example:
I have form1, it contains a text box and a button.
I click on the button and an instance of form2 shows up.
I have a button on form2, I click on this button, and the text property of
the text box on form1 changes.
Any ideas on how do I do that?

[Sameh Ahmed]

Dear Supra and John
I know what you mean, and i have to declare a variable of form1 type.
But this would be appropriate if i am calling a new instance of form1. which
is not the case.
as fom1 is the caller for form2 and i need to modify a control on the
existing form1.

* when i added
form1.textbox1.text = "test"
the error "Reference to a non-shared member requires an object reference."
was generated.

* When I added
Dim frn As Form1
frn.textbox1.text = "test"
the runtime error "Object reference not set to an instance of an object."
was generated

* As for using
Dim frn As new Form1
frn.textbox1.text = "test"
nothing happens and when i show frm the control property is modified
nnormally, but again i want to modiy a property in the calling form not in a
freshly called instance.

thanks again and hope somebody can help.
Regards
Sameh
"jcrouse" <an*******@discussions.microsoft.com> wrote in message
news:0E**********************************@microsof t.com...

Yes...it's kind of like a file path. Just precede the controlname (button1) with the form name(form1). Such as: "form1.button1.text = "OK""
You will also need to declare form1 on form2 if you reference it. Put a statement such as: "Dim frm1 as New Form1" on form2.
John

[jcrouse]

I'm just learning .Net also and I know it sounds wrong but you NEED to declare form1 on form2 with a statement like

dim frm1 as new Form

then reference it as frm1. Even though it already exists

John

[ISK]

the idea is right.

here's what you can do.

'This is code in form1 for some button1 which is loading your form2 - note the Init metho
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Clic
Dim ofrm As New Form
ofrm.Init(Me
ofrm.Show(
End Su

'This is code in form2 - the Init method takes in a reference to type form1 - this will give you the handle to your calling for
Private m_oCallingForm As Form

Friend Sub Init(ByRef oCallingForm As Form1
m_oCallingForm = oCallingFor
End Su

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Clic
m_oCallingForm.Button1.Text = "Changed
End Su

hope this helps.

----- jcrouse wrote: ----

I'm just learning .Net also and I know it sounds wrong but you NEED to declare form1 on form2 with a statement like

dim frm1 as new Form

then reference it as frm1. Even though it already exists

John

[Sameh Ahmed]

Did not work
as this is not the instance that needs to be modified
Regards
Sameh
"jcrouse" <an*******@discussions.microsoft.com> wrote in message
news:49**********************************@microsof t.com...

I'm just learning .Net also and I know it sounds wrong but you NEED to declare form1 on form2 with a statement like:
dim frm1 as new Form1

then reference it as frm1. Even though it already exists.

John