stringbuilder pick file up create new file for every line code example

Example 1: c# stringbuilder to file

using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"\hereIam.txt"))
{
    file.WriteLine(sb.ToString()); // "sb" is the StringBuilder
}

Example 2: c# stringbuilder to file

System.IO.File.WriteAllText(@"C:\TextFile.txt", stringBuilder.ToString());