Here My Complete Function to generate random password with desired length
(thanks to Viacheslav Smityukh)
private String GeneratePassword(int genlen = 21, bool usenumbers = true, bool uselowalphabets = true, bool usehighalphabets = true, bool usesymbols = true)
{
var upperCase = new char[]
{
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U',
'V', 'W', 'X', 'Y', 'Z'
};
var lowerCase = new char[]
{
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u',
'v', 'w', 'x', 'y', 'z'
};
var numerals = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
var symbols = new char[]
{
'~', '`', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '{', '[', '}', ']', '-', '_', '=', '+', ':',
';', '|', '/', '?', ',', '<', '.', '>'
};
char[] total = (new char[0])
.Concat(usehighalphabets ? upperCase : new char[0])
.Concat(uselowalphabets ? lowerCase : new char[0])
.Concat(usenumbers ? numerals : new char[0])
.Concat(usesymbols ? symbols : new char[0])
.ToArray();
var rnd = new Random();
var chars = Enumerable
.Repeat<int>(0, genlen)
.Select(i => total[rnd.Next(total.Length)])
.ToArray();
return new string(chars);
}