title: check if word start with uppercase or lowercase
body: <p>i need to write a program that when it found <code>"."</code> in text it should check the next word if it starts with capital letter (uppercase) then it will but the word before "." in a list box if not (start with lowercase)then but the word before it in another list box 
  i have this to far but its seems not useful  :</p>
  
  <pre><code>string st= File.ReadAllText(@"D:\\f1.txt");
  textBox1.Text = st;
  string[] s = st.Split(' ');
  for (int i = 0; i &lt;= s.Length; i++)
  {
      if (s[i] == ".")
      {
          string v = s[i + 1];
          var c = v.ToCharArray();
          string ss=Convert.ToString(c[0]);
          if (Regex.IsMatch(ss, "[A-Z]"))
              listBox1.Items.Add(s[i - 1]);
          else
              listBox2.Items.Add(s[i - 1]);
      }
  </code></pre>
  
  <p>}</p>