how to generete random password

I want to develop a login form that except the password and store it in encrypted format and while retriveing that password it will show in decrypted format.

If user will not enter password then it will generate any random password.Please help me out I am really new to ASP.Net

It depends on what rules you're using for valid passwords but the following will give you an idea of how they can be generated in a simple case - password length 8 to 12 characters which can be any upper or lower case letters or digits.

For illustration purposes, I've used a console application:

using System;

using System.Text;

class Test

{

// needs to be a field to get different answers each time program is run

static Random rand = new Random();

static void Main()

{

// get 20 random passwords

for(int i = 1; i <= 20; i++)

{

string password = GetRandomPassword();

Console.WriteLine(password);

}

Console.ReadKey();

}

static string GetRandomPassword()

{

// get random length between 8 and 12 characters

int len = rand.Next(8, 13);

/* now get 'len' random characters

0 - 25 represents a to z

26 - 51 represents A to Z

52 - 61 represents 0 to 9

var sb = new StringBuilder(len);

for(int i = 1; i <= len; i++)

{

int temp = rand.Next(0, 62);

char c;

if (temp < 26)

{

c = (char)(temp + 97);

}

else if (temp < 52)

{

c = (char)(temp + 39);

}

else

{

c = (char)(temp - 4);

}

sb.Append(c);

}

return sb.ToString();

}

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

Satyapriya Nayak13y ago
http://www.c-sharpcorner.com/UploadFile/rohatash/generate-random-password-in-Asp-Net/
http://www.c-sharpcorner.com/uploadfile/brij_mcn/generating-random-passwords-with-asp-net-and-C-Sharp/default.aspx
Vulpes13y ago
It depends on what rules you're using for valid passwords but the following will give you an idea of how they can be generated in a simple case - password length 8 to 12 characters which can be any upper or lower case letters or digits.

For illustration purposes, I've used a console application:

using System;
using System.Text;

class Test
{
// needs to be a field to get different answers each time program is run
static Random rand = new Random();

static void Main()
{
// get 20 random passwords
for(int i = 1; i <= 20; i++)
{
string password = GetRandomPassword();
Console.WriteLine(password);
}

Console.ReadKey();
}

static string GetRandomPassword()
{
// get random length between 8 and 12 characters
int len = rand.Next(8, 13);

/* now get 'len' random characters
0 - 25 represents a to z
26 - 51 represents A to Z
52 - 61 represents 0 to 9
*/

var sb = new StringBuilder(len);

for(int i = 1; i <= len; i++)
{
int temp = rand.Next(0, 62);
char c;

if (temp < 26)
{
c = (char)(temp + 97);
}
else if (temp < 52)
{
c = (char)(temp + 39);
}
else
{
c = (char)(temp - 4);
}

sb.Append(c);
}

return sb.ToString();
}
}