gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1 {
    class Program {
        static void Main(string[] args) {

            //list is a class object that #
            //can be used for put dynamic data into
            List<int> intList = new List<int>();
            List<float> floatList = new List<float>();
            List<char> charList = new List<char>();
            List<bool> boolList = new List<bool>();
            List<string> stringList = new List<string>();

            //StreamReader is a class #
            System.IO.StreamReader txtFile = new System.IO.StreamReader("data.txt");

            string line; //contains for each line through the loop

            //line is a text-string / char-array
            while ((line = txtFile.ReadLine()) != null) { //reads every line in the txt file until it reaches the end of file
                
                //Console.WriteLine((int)line[0]); //just there to test if the txt file worked

                //decimal 48-57, which will be 0-9 (Symbol)

                bool isInt = true; //is set to true because 
                bool isFloat = true;

                //we use char because char is pretty much already an ascii
                foreach (char c in line) { //reads through every char for each text-string
                    int ascii = (int) c; //casts a char into its ascii representation in int
                    if(ascii < 48 || ascii > 57) { //if any char is outside 48-57 = 0-9, then its not an int  
                        isInt = false; //so any char that is not between 48-58 is therefore not an int (int = false)
                    }
                    if((ascii < 48 || ascii > 57) && ascii != 46) { //dot '.' = 46, but 46 is smaller than 48, ...
                        isFloat = false; //so any char that is not between 48-58 and is not 46 is therefor not a float (flaot = false)
                    }
                }
                
                if (line.Length < 1) { //we use "<1" because if the line is empty, which is less than 1
                    Console.WriteLine("Empty line here");
                } else if (isInt) {
                    //Parse #
                    int result = Int32.Parse(line); //we use Int32.Parse to change line (string) into an int
                    intList.Add(result); //adds the result to the intList of varibles
                    Console.WriteLine("it's an int = " + result);
                } else if (isFloat) {
                    float result = float.Parse(line);
                    floatList.Add(result);
                    Console.WriteLine("it's a float = " + result);
                } else if (line == "true" || line == "false") {
                    bool result = Boolean.Parse(line);
                    boolList.Add(result);
                    Console.WriteLine("it's a bool = " + result);
                } else if (line.Length == 1) { //==1 because a char is just a single symbol, e.g. 'a','b','c'
                    char result = line[0]; //takes the first char of the list/array and because there can only be one highlander!
                    charList.Add(result);
                    Console.WriteLine("it's a char = " + result);
                } else if (line.Length > 1) { //>1 because a string is multiple symbols, e.g. "grimme mand"
                    stringList.Add(line);
                    Console.WriteLine("it's a string = " + line);
                }
            }//while-loop ends
            txtFile.Close(); //whenever you open a file it only make sense to close it afterwards
            //e.g. if more programs are using the same file, then they might overwrite each other and make a mess
            //or if we don't do that then the OS won't be allowed access to the file, or make an error or might goes on a queue
        }
    }
}