ASP.NET

for (int i=0;i<=ListBox1.Items.Count;i++)<br />
{<br />
   if(ListBox1.Items[i].Selected==true)<br />
   {<br />
     //do something here <br />
   }<br />
   else<br />
   {<br />
     //do something else here<br />
   }<br />
}

public bool FileIsLocked(string strFullFileName) {
        bool blnReturn = false;
        System.IO.FileStream fs;
        try {
            fs = System.IO.File.Open(strFullFileName, IO.FileMode.OpenOrCreate, IO.FileAccess.Read, IO.FileShare.None);
            fs.Close();
        }
        catch (System.IO.IOException ex) {
            blnReturn = true;
        }
        return blnReturn;
    }