I have code like the following that turns a list of strings into one string of the contents separated by n

List<string> list = new List<string>();
list.Add("string1");
list.Add("string2");
list.Add("string3");

string stringOfListContents = string.Join("n", list);

then when I write the string to a output file like:

using (PowerShell PowerShellInstance = PowerShell.Create())
{
    PowerShellInstance.Streams.ClearStreams();
    PowerShellInstance.AddCommand("Set-Content");

    PowerShellInstance.AddParameter("Path", outputFile);
    PowerShellInstance.AddParameter("Value", stringOfListContents);

    PowerShellInstance.Invoke();
}

The result is

string1string2string3

but I would like the result in the txt file to be like

string1
string2
string3