Call child's function from parent form

[LEE]

I'd like to call a function of child from parent form,
there is an issue:

Form1 (parent) calls "LoadMe" Sub in Form2 (child), it
works using the codes (in Form1):
Dim frm As New Form3()
frm.LoadMe()

but fails using these codes:
Dim frm As Form ' defined as a global variable
frm = New Form3()
frm.LoadMe()

How to fix it?

Thanks

 

[Armin Zingler]

I'd like to call a function of child from parent form,
there is an issue:

Form1 (parent) calls "LoadMe" Sub in Form2 (child), it
works using the codes (in Form1):
Dim frm As New Form3()
frm.LoadMe()

but fails using these codes:
Dim frm As Form ' defined as a global variable
frm = New Form3()
frm.LoadMe()

How to fix it?

Dim frm As Form3 ' defined as a global variable
frm = New Form3()
frm.LoadMe()

 

[Phill. W]

I'd like to call a function of child from parent form, .. . .
Dim frm As New Form3()
frm.LoadMe()

but fails using these codes:
Dim frm As Form ' defined as a global variable
frm = New Form3()
frm.LoadMe()

Fails /how/ exactly? Exception message?
We're not [all] psychic... ;-)

If you're using Option Strict (and you should be), you might need
to type-cast Form3 into your Form variable.

Assuming that Form3 is a Windows.Forms.Form (and you're not
using Option Strict, which you should be), I would still question this
line:

Dim frm As Form ' defined as a global variable

(OK, code and comments frequently disagree, but... )
In VB.Net, this syntax can /never/ give you a Global variable.
In a VB6 module, yes, Dim is the same as Public or Global, but here,
in the Brave New World, this is the same as coding:

Private frm As Form

which will /only/ be accessible within the Module.

You /are/ using "Option Explicit On", aren't you?

HTH,
Phill W.

 

[CJ Taylor]

I'd like to call a function of child from parent form,
there is an issue:

Form1 (parent) calls "LoadMe" Sub in Form2 (child), it
works using the codes (in Form1):
Dim frm As New Form3()
frm.LoadMe()

but fails using these codes:
Dim frm As Form ' defined as a global variable
frm = New Form3()
frm.LoadMe()

instead of calling frm.loadme you would have to do

Ctype(frm, form3).Loadme

frm itself has no method named Loadme, so does not really know that load me
exists.