Generate Random Password combination of Alphabates, Numbers and Special Charactors

Here I am giving a common function to generate a random string combination of Alphabates, Numbers and Special Charactors.

public string GenerateString(int size)
        {
            Random rand = new Random();
            string Alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            string Number = "0123456789";
            string SpecialChar = "!@#$&";
            char[] chars = new char[size];
            int count = 0;
            int j = Number[rand.Next(10)];
            for (int i = j; i < (size*100); i++)
            {
                if (i % 2 == 0)
                {
                    chars[count] = Alpha[rand.Next(26)];
                    count++;
                    if (count == size)
                        break;                   
                }
                if (i % 3 == 0)
                {
                    chars[count] = Number[rand.Next(10)];
                    count++;
                    if (count == size)
                        break;                   
                }
                if (i % 5 == 0)
                {
                    chars[count] = SpecialChar[rand.Next(5)];
                    count++;
                    if (count == size)
                        break;                   
                }                               
            }
            string FinalCode = new string(chars);
            return FinalCode;
       }

Call this function where ever you want with the size of the string that you want to generate. like this

GenerateString(8);