LINQ one-liner to determine selected radio button in group

Here is a LINQ one-liner to determine which radio button inside a groupbox is selected. To use it,  pass the selected RadioButton object to another method for processing. Here is an example:

Output Type

[*] Excel 2007
[ ] Excel 2003
[ ] HTML

var checkedButton = grpbxOutputType.Controls.OfType 
         <RadioButton>().FirstOrDefault(r => r.Checked);
WriteOutputFile (mdtKcData, (RadioButton)checkedButton);

Inside the method, use the radio button’s name or text to determine the selected option:

private void WriteOutputFile(DataTable dt, RadioButton rb)
{
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    {
      case ("rbOutputTypeExcel2007"):
          //Write file as Excel 2007
          break;
      case ("rbOutputTypeExcel2003"):
          //Write file as Excel 2003
          break;
      case ("rbOutputTypeHTML"):
          //Write file as HTML
          break;
    }
}