Access controls from another form (mdi)

[tonyf]

I have a main form that has a Statusbar control on it. I am then opening several child forms within this main form.

How do i access the Statusbar control from within these child forms? any ideas?

[coolbiz]

You will need to pass the reference of your main form to the child forms. Then a child form can refer any controls on the main form through that reference.

-Cool Bizs

[tonyf]

am just getting to grips with vb.net so not really sure how to do that.

can you give me any pointers?

[coolbiz]

There are few ways to do this. Here is one.

Lets say your main FORM class name is FMain and your child FORM class is called FChild. Then consider the following:

' your main FORM
public class FMain
...
  ' when you add a control the declaration should look like this
  friend withevents txtUsername as textbox
...

  ' show the child
  private sub showchild()
    dim myChild as new FChild()
    myChild.ParentForm = me
    ....
  end sub
...
end class

' your child FORM
public class FChild
...
  ' var to hold the parent
  public ParentForm as FMain = Nothing
...
  ' access the textbox in main form
  private sub DummyProc()
    if (not m_MainForm is nothing) then m_MainForm.txtUsername.Text = "From CHILD class."
  end sub
...
end class

Again, you have so many ways depending on how you instantiate the child form. The basic idea is to have a reference to the parent object so that you can access any exposed members (declared with either PUBLIC or FRIEND).

//EDIT: variable name in child form was corrected.

-Cool Bizs

[tonyf]

many thanks.

[pepesmith]

my apology for using your thread sir tonyf

Sir CoolBiz, How about using the MDIParent as one of the property the child form instead of making an instance ParentForm in the child form? Is it possible?

Thanks...

[coolbiz]

You're probably right. If MDI child form exposes a variable MDIParent, that should also point to the parent form. Try it out and post the relsult

-Cool Bizs