Using Write method


using System.IO;
using System;

class WriteFile
{
    static void Main()
    {
        //The Write method does not append a newline as done by WriteLine method.
        FileStream fs = new FileStream("D://MyFile.txt", FileMode.Create);
        fs.Close();
        Console.WriteLine("File Created Sucessfully");

        StreamWriter writer = new StreamWriter("D://MyFile.txt");
        writer.Write("Word 1");
        writer.Write("word 2");
        writer.Flush();
        Console.WriteLine("Written to file Sucessfully");

        Console.ReadLine();
    }
}

Output:
File Created Successfully
Written to file Successfully