NamingVariable_ALGORI/001

 Console.Write("Input a String : ");
            string variable = Console.ReadLine();
            char[] ch = variable.ToCharArray();


            if (!(ch[0] < 47 || ch[0] > 58))
            {
                Console.Write("Kindly Check because first character won't accept Space \n nor Digit or Special Character. \n THANK YOU");
            }

            else
            {
                foreach (char cha in variable)
                {
                    Convert.ToInt32(cha);
                    if ((!(cha < 64 || cha > 90) || !(cha < 97 || cha > 122) || !(cha < 48 || cha > 57) || (cha == 95)))
                    {

                    }
                    else
                    {
                       Console.WriteLine(cha + " is an invalid character\n Whole string  will be Invalid");
                        Console.ReadLine();
                        return;
                    }

                }

                Console.WriteLine("Variable string is VALID");
            }
            Console.ReadLine();
            }
            //coded by : ACT
        }
    }