Accessing controls on another form.

[DaveG]

Hi

I posted this to the .Net general newsgroup and got a reply from "Morten"
who has given me an answer but in C# a language I have never worked with.
VB.Net is still very new to me, I was hoping someone here in the VB.net
group could help me a little. I have copied the posts to here.

Morten has given me a code snippet in C# but where do I use it and what is
the VB.Net equivalent.

Thanks DaveG

''''''''' Orig Post ''''''''''''''

Hi

Using VB.net 2003

I know how to access controls on a 2nd form after declaring the form
in the first.

But how do I access the controls on the original form from the 2nd
form.

(in frmMain)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
Dim form2 As New Form2
form2.TextBox1.Text = TextBox1.Text
form2.Show()
End Sub

(in Form2)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
Dim form1 As New Form1
form1.TextBox1.Text = TextBox1.Text
form1.Update()
Me.Close()

End Sub
Form2 textbox updates ok
The textbox in form1 does not update and still holds the original text
before opening Form2

This is just a simple example I cannot get working, once I can get
this working the I should not have problems with the actual code I
need to use.

There must be a simple answer to this....???

Thanks in advance for any help given

DaveG

Hi Dave,

You need to pass a reference to your 1st form when declaring the 2nd,
typically

Form2 f2 = new Form2(this); // Me in VB

Overload the constructor of the 2nd form to accept a 1st form
parameter. Store the parameter for later use

On Sat, 30 Apr 2005 13:29:05 +0200, DaveG <no**********@daveg.co.uk>
wrote:

Thanks Morten

Now the problem is I have used the overload in normal funtions and subs
but never with the constructors, so now I'm a little lost, I understand
the reasons for the overload..... so the New form2(Me) will be excepted
bur how to implement it is where I am stuck......

Dave, overloading a constructor is done the exact same way, although I'm
not sure how the VB syntax is. Store the Form1 reference for later use.

private Form1 myParent;

public Form2(Form1 f)
{
myParent = f;
}

then simply call

myParent.MethodOrSimilarInForm1()

whenever you need.

[Cor Ligthert]

Dave,

There are many roads that goes to Rome

Your mainform
\\\
Dim frm As New Form2
frm.Owner = Me
frm.Show()
///
You form where you want to use it.
\\\
MessageBox.Show(DirectCast(Me.Owner, Form1).TextBox1.Text)
///
Assuming that you have a textbox1 on form1

I hope this helps,

Cor

[Herfried K. Wagner [MVP]]

"DaveG" <no**********@daveg.co.uk> schrieb:

I posted this to the .Net general newsgroup and got a reply from "Morten"
who has given me an answer but in C# a language I have never worked with.
VB.Net is still very new to me, I was hoping someone here in the VB.net
group could help me a little. I have copied the posts to here.

Depending on the situation direct access to the parent form isn't required
in order to update the parent form upon closing the other form:

<URL:http://groups.google.de/groups?selm=%237sTDoqHFHA.3208%40TK2MSFTNGP10.phx. gbl>

In MDI environments:

\\\
DirectCast(Me.MdiParent, MainForm).TextBox1.Text = ...
///

Providing a reference to an application's main form
<URL:http://dotnet.mvps.org/dotnet/faqs/?id=accessmainform&lang=en>

In VB 2005 you can access form instances more easily with 'My.Forms.*'.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[DaveG]

Thanks guys for your quick responses.

I think I am crawling along one of these roads to Rome. now I can see how
I am supposed to implement a basic setup I'm sure I can play a little, if
not "I shall be back".

DaveG

On Sun, 01 May 2005 09:54:54 +0200, DaveG wrote:

Hi

I posted this to the .Net general newsgroup and got a reply from
"Morten" who has given me an answer but in C# a language I have never
worked with. VB.Net is still very new to me, I was hoping someone here
in the VB.net group could help me a little. I have copied the posts to
here.

Morten has given me a code snippet in C# but where do I use it and what
is the VB.Net equivalent.

Thanks DaveG

''''''''' Orig Post ''''''''''''''

Hi

Using VB.net 2003

I know how to access controls on a 2nd form after declaring the form
in the first.

But how do I access the controls on the original form from the 2nd
form.

(in frmMain)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
Dim form2 As New Form2
form2.TextBox1.Text = TextBox1.Text
form2.Show()
End Sub

(in Form2)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
Dim form1 As New Form1
form1.TextBox1.Text = TextBox1.Text
form1.Update()
Me.Close()

End Sub
Form2 textbox updates ok
The textbox in form1 does not update and still holds the original
text before opening Form2

This is just a simple example I cannot get working, once I can get
this working the I should not have problems with the actual code I
need to use.

There must be a simple answer to this....???

Thanks in advance for any help given

DaveG Hi Dave,

You need to pass a reference to your 1st form when declaring the 2nd,
typically

Form2 f2 = new Form2(this); // Me in VB

Overload the constructor of the 2nd form to accept a 1st form
parameter. Store the parameter for later use

On Sat, 30 Apr 2005 13:29:05 +0200, DaveG <no**********@daveg.co.uk>
wrote:

Thanks Morten

Now the problem is I have used the overload in normal funtions and subs
but never with the constructors, so now I'm a little lost, I understand
the reasons for the overload..... so the New form2(Me) will be excepted
bur how to implement it is where I am stuck......

Dave, overloading a constructor is done the exact same way, although I'm
not sure how the VB syntax is. Store the Form1 reference for later use.

private Form1 myParent;

public Form2(Form1 f)
{
myParent = f;
}

then simply call

myParent.MethodOrSimilarInForm1()

whenever you need.