Writing to a file using the System.IO.File class C# with Example

You can use the System.IO.File.WriteAllText function to write a string to a file. 
string text = "String that will be stored in the file"; 
System.IO.File.WriteAllText(@"C:\MyFolder\OutputFile.txt", text); 
You can also use the System.IO.File.WriteAllLines function which receives an IEnumerable as the second 
parameter (as opposed to a single string in the previous example). This lets you write content from an array of 
lines. 
string[] lines = { "My first string", "My second string", "and even a third string" }; 
System.IO.File.WriteAllLines(@"C:\MyFolder\OutputFile.txt", lines);