How to generate random password in in asp.net ?

string passwordChars = "abcde...123..."; // A string containing all the characters that is allowed in the final password
Random random = new Random();
int passwordLength = random.Next(5,7); // the length of the final password

StringBuilder password = new StringBuilder(passwordLength)
for(int i = 0; i < passwordLength; i++)
    // randomly take a character from the passwordChars string and append to the password
    password.Append(passwordChars[random.Next(0, passwordChars.Length)]);