How to validate atleast one radio button is checked in a groupbox in C#?

How to validate atleast one radio button is checked in a groupbox in C#?
JesuSingarayarAsked:
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dqmqCommented:
If you set the default value of the groupbox, does that not guarantee that one of the radio buttons is always selected?  
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rpkhareCommented:
Yes, set the Default Property of one of the radio button to True.
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JesuSingarayarAuthor Commented:
I had to make the user to pick ONE option & i didnt want it to be a default one. The problem happens when the user forgets to input any value. I have to catch his mistake and say "hi can can you enter all the values" when she presses output button.Thanks.
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rpkhareCommented:
In that case you need to write the code. Something like this:

if (!radioButton1.Checked && !radioButton2.Checked)
        //Nothing Selected
else
       //Something selected
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JesuSingarayarAuthor Commented:
Thanks rpkhare,
Is there any code like...
if (!grpbox1.Checked == true)
{
msgbox ("can can you enter a value");
}
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rpkhareCommented:
GroupBox is not checked or UnChecked. Alternatively,

if (!radioButton1.Checked && !radioButton2.Checked)
       GroupBox1.Enabled = false;
else
       GroupBox1.Enabled = true;
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JesuSingarayarAuthor Commented:
Please Assume a groupbox has 30 radio buttons And there is no default set.
The user has to pick one in 30 options and click on Execute to to perform a job.
If they haven't picked any of the 30 options. When execute is clicked, msg box should pop up and say " pick up one of the 30 options". How would i do that?
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rpkhareCommented:
Please look at the solution provided by Morten Wennevik in the below link:
http://bytes.com/forum/thread261844.html

And also,
http://www.experts-exchange.com/Programming/Languages/C_Sharp/Q_22589784.html
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JesuSingarayarAuthor Commented:
Thank YOU rpkhare!!!
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