How I add parsed lines into a dictionary?

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C#

I am trying to make a dictionary where the compiler reads from a text file where there are two words per line. I have parsed it through the split() method but I am struggling on how to add the corresponding keys and values from the line to the dictionary container. I am trying to add it in the ReadStream2() function after doing the split() in the line line.add(words[0],words[1]). I know this is wrong but I have no idea how to combine what I am parsing into the dictionary in terms of keys and values.Also on the part where I write the askWord() function I am trying to state that if a line key matches with user input it will output the value(translation) of the word. But the line object of the dictionary I created does not pick up keys and values. Thanks!

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

namespace Project_Dictionary
{
    class Program
    {


        static void Main(string[] args)
        {
            Dictionary<string, string> line = new Dictionary<string, string>();
            FileStream filestream = null;
            string path = "Dictionary.txt";
            //WriteByte(filestream, path);
            //ReadByte(filestream, path);
            //WriteStream(filestream, path);
            //ReadFromFile();
            Menu(filestream, path);
            ReadStream2(filestream,path);
            
            Group(filestream, path);
            
        }
       
        static void WriteByte(FileStream filestream, string path)
        {
            string str;
            
            Console.WriteLine("Enter word");
            str = Console.ReadLine();
            try
            {
                filestream = new FileStream("Dictionary.txt", FileMode.Open, FileAccess.Write);
                byte[] by = Encoding.Default.GetBytes(str);
                filestream.Write(by, 0, by.Length);
                Console.WriteLine("File written");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                filestream.Close();
            }
        }
        static void ReadByte(FileStream filestream, string path)
        {

            try
            {
                filestream = new FileStream(path, FileMode.Open, FileAccess.Read);
                byte[] by = new byte[(int)filestream.Length];
                filestream.Read(by, 0, by.Length);
                string str = Encoding.Default.GetString(by);
                Console.WriteLine("File read");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            finally
            {
                filestream.Close();
            }
        }
        static void WriteStream(FileStream filestream, string path)
        {
            using (filestream = new FileStream(path, FileMode.Append, FileAccess.Write))
            {
                using (StreamWriter streamWriter = new StreamWriter(filestream))
                {
                    //string str;
                    //Console.WriteLine("Enter word");
                    //str = Console.ReadLine();
                    //streamWriter.WriteLine(str);
                }
            }
        }
        static void ReadStream2(FileStream fileStream, string path)
        {
            using (fileStream = new FileStream(path, FileMode.Open, FileAccess.Read))
            {
                Dictionary<string, string> line = new Dictionary<string, string>();
                using (StreamReader sw = new StreamReader(fileStream))
                {
                    string rez = "";
                    
                    while(sw.Peek() > 0)
                    {
                        rez = sw.ReadLine();
                        
                        Console.WriteLine(rez);
                        string[] words = rez.Split(' ');
                        line.Add(words[0], words[1]);
                       
                    }
                
                    
                    
                }
            }
        }
        static void Group(FileStream fileStream, string path)
        {
            var line = File
            .ReadLines(path)
            .Select((v, i) => new { Index = i, Value = v })
            .GroupBy(p => p.Index / 2)
            .ToDictionary(g => g.First().Value, g => g.Last().Value);
        }
        static void Menu(FileStream fileStream, string path)
        {
            char choice;
            Console.ForegroundColor = ConsoleColor.Green;

            Console.WriteLine("Welcome this is a English-Ukrainian dictionary press d to continue");
            Console.ResetColor();
            choice = Convert.ToChar(Console.ReadLine());
            while (choice == 'd' || choice == 'D')
            {
                ReadStream2(fileStream, path);
            }
        }
        static void askWord()
        {
            string ask;
            Console.WriteLine("What english word would you like to translate");
            ask = Console.ReadLine();
            if (ask == )
        }

    }
}

What I have tried:

I have tried combining it all but I do not know how to proceed in tying it into the dictionary container and then extracting the corresponding keys and values.