auto generate password and send it to newly create user email id

public string fillVerCode()
        {
            int codeCount = 6;
            string allChar = "0,1,2,3,4,5,6,7,8,9,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";
            string[] allCharArray = allChar.Split(',');
            string randomCode = "";
            int temp = -1;

            Random rand = new Random();
            for (int i = 0; i < codeCount; i++)
            {
                if (temp != -1)
                {
                    rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
                }
                int t = rand.Next(36);
                if (temp != -1 && temp == t)
                {
                    return fillVerCode();
                }
                temp = t;
                randomCode += allCharArray[t];
            }
            return randomCode;
        }