First, create a new console app:

Next, add:
using System.IO;
Now add code:
using (StreamWriter writer = new StreamWriter("filename.txt"))
{
writer.Write("1");
writer.WriteLine("2");
writer.WriteLine("3");
writer.Write("4");
}Now go to the directory you ran the code from. You will see the filename.txt file created:

This code can also be written as:
StreamWriter writer = new StreamWriter("filename.txt");
writer.Write("1");
writer.WriteLine("2");
writer.WriteLine("3");
writer.Write("4");
writer.Flush();
writer.Close();
THANKS FOR READING. BEFORE YOU LEAVE, I NEED YOUR HELP.
I AM SPENDING MORE TIME THESE DAYS CREATING YOUTUBE VIDEOS TO HELP PEOPLE LEARN THE MICROSOFT POWER PLATFORM.
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THANK YOU, AND LET'S KEEP LEARNING TOGETHER.
CARL
