1 string str=textbox.text;
 2 char[] charList = str.ToArray();
 3 string bNum="";
 4 string sNum ="";
 5 string nNum = "";
 6 string otherNum = "";
 7               foreach (char c in charList)
 8               {
 9                   if (System.Text.RegularExpressions.Regex.IsMatch(c.ToString(), "[A-Z]"))
10                   {
11                       bNum += c.ToString();
12                   }
13                   else if (System.Text.RegularExpressions.Regex.IsMatch(c.ToString(), "[0-9]"))
14                   {
15                       nNum += c.ToString();
16                   }
17                   else if (System.Text.RegularExpressions.Regex.IsMatch(c.ToString(), "[a-z]"))
18                   {
19                       sNum += c.ToString();
20                   }
21                   else
22                   {
23                       otherNum += c.ToString();
24                   }
25               }
26               Console.WriteLine("bNum:" + bNum);
27               Console.WriteLine("sNum:" + sNum);
28               Console.WriteLine("nNum:" + nNum);
29               Console.WriteLine("otherNum:" + otherNum);
30               Console.ReadLine();