generate password automatically using asp.net core

Try this simple code method:

private static string CreateRandomPassword(int length = 15)
{
// Create a string of characters, numbers, special characters that allowed in the password
string validChars = "ABCDEFGHJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*?_-";
Random random = new Random();
// Select one random character at a time from the string
// and create an array of chars
char[] chars = new char[length];
for (int i = 0; i < length; i++)
{
chars[i] = validChars[random.Next(0, validChars.Length)];
}
return new string(chars);
}

https://www.c-sharpcorner.com/article/how-to-generate-a-random-password-in-c-sharp-and-net-core/