Windows temporary files behaviour - are they deleted by the system?

Question

Using the .net framework you have the option to create temporary files with

Path.GetTempFileName(); 

The MSDN doesn\'t tell us what happens

Answer 1

I've read on the internet a lot of times that people don't want to use Path.GetTempFileName because they say it could return an already existing file, to solve the problem you can make a filename based on a GUID.

This Function solves that Problem: Iterates until it finds a nonexistent file name with an specific extension.

VB.net

Public Shared Function GetTempFileName(ByVal extensionWithDot As String) As String
    Dim tempFileName As String
    Do
        tempFileName = System.IO.Path.GetTempFileName
        If extensionWithDot IsNot Nothing Then
            tempFileName = tempFileName.Replace(System.IO.Path.GetExtension(tempFileName), extensionWithDot)
        End If
    Loop While System.IO.File.Exists(tempFileName)
    Return tempFileName
End Function

C#:

public static string GetTempFileName(string extensionWithDot)
{
    string tempFileName = null;
    do {
        tempFileName = System.IO.Path.GetTempFileName;
        if (extensionWithDot != null) {
            tempFileName = tempFileName.Replace(System.IO.Path.GetExtension(tempFileName), extensionWithDot);
        }
    } while (System.IO.File.Exists(tempFileName));
    return tempFileName;
}

Note: I use argument extensionWithDot because System.IO.Path.GetExtension returns with dot.