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  • Status: Solved
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C# Windows App

Hello,

I have a Main form 'Parent' and in that form i have a button 'A'. if i click on the button 'A' in the parent form it takes me to a differnt form 'Child'. (like this)

frmA dr = new frmA();
dr.Show();

In 'Child' i have 2 buttons. One: Submit Second: Clear/Close. I have implemented all the funtionality for the 'Child' form.
After validating the 'Child' form the Submit button gets disabled and Clear button becomes Close button.

Now My question is::

When i click the Close button i want the Button 'A' in the 'Parent' form also to get disabled. I mean, After validating, submitting and closing the  child form the Button on the Parent form should also get disabled. How can i do it?
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karra
Asked:
karra
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2 Solutions
 
int_20hCommented:
you can pass the parent instance to the child form and create a public method in the parent that sets a boolean to disable the button.  In the child form, after validating the input, call the public method in the parent to disable the button.
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gregoryyoungCommented:
you can also have the child form raise an event that the parent catches and then have the parent change the button state
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karraAuthor Commented:
Can some one show me an example please?
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gregoryyoungCommented:
of my method ?

            public delegate void DisableButtonEventHandler(object sender, EventArgs e);
            public event DisableButtonEventHandler DisableButton;

            protected virtual void OnDisableButton(EventArgs e) {
                  if (DisableButton != null)
                        DisableButton(this, e);
            }
Child foo = new Child() ;
foo.DisableButton += new DisableuttonEventHandler(this.methodtohandle);

when you want the button disabled call OnDisableButton then trap the event in the parent the way you would any other event ... this also allows other things to trap it in the future


of his Method ...

You add a property to the child of parent (type is type of the parent)

Add a public  method to the parent DisableButton()

then in the child you say Parent.DisableButton() when you want it to be disabled

once done this allows easier future exchanges between the parent and child ...
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karraAuthor Commented:
I got along with this problem with a easy answer.

child.ShowDialog(this);
if(!child.IsAccessible)
    btnChild.Enabled = false;
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