group box

Hi Juli,

You can access any controls inside container controls like panels and
groupboxes.
Use the Controls property of the GroupBox to access its controls.

int n = 0;
foreach(Control c in MyGroupBox.Controls)
{
if(c is RadioButton)
n++;
}
MessageBox.Show("My GroupBox contains " + n + " RadioButtons.");

You can calculate the size based in the number of radiobuttons or access
the size of each control inside the GroupBox and add them together.

int h = 0;
int w = 0;
foreach(Control c in MyGroupBox.Controls)
{
if(c is RadioButton)
{
h += c.Size.Height;
w += c.Size.Width;
}
}

You can also set the Tag/Name property of the RadioButtons to identify
them further.

--
Happy Coding!
Morten Wennevik [C# MVP]

Hello,
I tried to do this:
foreach (Control c in this.groupBox1.Controls)
{
groupBox1.Size.Height=groupBox1.Size.Height+c.Heig ht;
}

but I keep getting compile error:
Cannot modify the return value of 'System.Windows.Forms.Control.Size'
because it is not a variable

How can I change this value?

Another question,
My controls inside the group box are radio buttons and I need to know
which one of them been selected,how do I do it via the group box?

Thanks a lot!

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Hi,

You can't set the height or width individually, you need to set the full
size property.

foreach (Control c in this.groupBox1.Controls)
{
groupBox1.Size = new Size(groupBox1.Size.Width, groupBox1.Size.Height
+ c.Height);
}

As for your second question, you need to cast the control back to a
radiobutton.

foreach (Control c in this.groupBox1.Controls)
{
RadioButton rb = (RadioButton)c;
if(rb.Checked)
// do stuff
}

Note that if you have other controls than radiobuttons you will get an
exception.
In that case, test for a radiobutton using if(c is RadioButton).

--
Happy Coding!
Morten Wennevik [C# MVP]

First of all ,Thanks! but I still have a problem with the size I did:
if(c is RadioButton)
{
groupBox2.Size = new Size(groupBox2.Size.Width,
groupBox2.Size.Height
+ c.Height);

}

but it becomes too huge ,maybe there need to be a casting or something ?
Thank you!

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Don't just participate in USENET...get rewarded for it!

Without having tested it, I'm assuming the groupBox have an initial
default size that you need to ignore. Try setting the initial size to 0 or
perhaps even better, store the height of the RadioButtons only and set
GroupBox size at the end.
int n = 0;
foreach(Control c in groupBox2.Controls)
{
if(c is RadioButton)
n += c.Height;
}

groupBox2.Size = new Size(groupBox2.Size.Width, n);
--
Happy Coding!
Morten Wennevik [C# MVP]