Исследование простого crackme

1. private string GeneratePassword()
2.     {
3.       string userName = txtUserName.Text;
4.  
5.       if (!String.IsNullOrEmpty(userName))
6.       {
7.         int i = 0;
8.         StringBuilder pass = new StringBuilder();
9.  
10.         pass.Append(userName);
11.  
12.         while (i < userName.Length)
13.         {
14.           pass[i] = GetNextASCIISymbol(userName[i]);
15.           i += 2;
16.         }
17.  
18.         return pass.ToString();
19.       }
20.  
21.       else
22.       {
23.         return String.Empty;
24.       }
25.     }
26.  
27.     private char GetNextASCIISymbol(char symbol)
28.     {
29.       int index = (int)symbol;
30.       char result = Char.MinValue;
31.  
32.       index++;
33.       result = Convert.ToChar(index);
34.  
35.       return result;
36.     }

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