Groupbox

Do you perhaps mean that you want to add a ListBox containing those items to your GroupBox?

If so, you first need to place a ListBox (listBox1 say) within the GroupBox in the VS designer and then add this code in (say) the Form_Load eventhandler:
   
   string[] fruits = {"apple", "mango", "pineapple"};
   listBox1.DataSource = fruits;
   listBox1.SelectedIndex = 0;

Hi Sweety,

Please refer the below links

http://www.c-sharpcorner.com/uploadfile/mahesh/groupbox-in-C-Sharp/

http://en.csharp-online.net/GroupBox

http://www.java2s.com/Code/CSharp/GUI-Windows-Form/GroupBox.htm

Thanks

Are you taking about radio button group or groupbox ?

http://www.functionx.com/vcsharp/controls/groupbox.htm
http://msdn.microsoft.com/en-us/library/system.windows.forms.groupbox.aspx