Deleting files

I'm having trouble with the following code:

private void button1_Click(object sender, System.EventArgs e)
{

string path="c:\\temp\\filetest.txt";
string lines = "First line.\r\nSecond line.\r\nThird line.";

System.IO.StreamWriter file = new System.IO.StreamWriter(path);
file.WriteLine(lines);

file.Close();
}

private void button2_Click(object sender, System.EventArgs e)
{
string path="c:\\temp\\filetest.txt";
File.Delete(path);
}

The code creates and deletes a file fine as long as only the program accesses the file. The problem is: I create the file then close the program. Open the created file with notepad. Close notepad and then rerun the file program and try to either create or delete the file I get the following error:

Additional information: The process cannot access the file "c:\temp\filetest.txt" because it is being used by another process.

I ran Sysinternal's ProcessExplorer and there were no other processes using this text file. Even after rebooting the computer I get this error.

Any help on this is greatly appreciated.

your code works fine for me.

Code:

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                private void button1_Click(object sender, System.EventArgs e)
                {
                        string path="c:\\temp\\filetest.txt";
                        string lines = "First line.\r\nSecond line.\r\nThird line.";
                        StreamWriter file=new StreamWriter(path);
                        file.WriteLine(lines);
                        file.Close();
                }

                private void button2_Click(object sender, System.EventArgs e)
                {
                        string path="c:\\temp\\filetest.txt";
                        File.Delete(path);
                }

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