Process CloseMainWindow() function doesn't work - coded-ui-tests

Question

I have a test method which requires Internet Explorer to be opened and closed numerous times during the test. I have been creating a process like this:
Process process = Process.Start(...);
And closing it like this:
process.CloseMainWindow();
However, I have found that I can only call this method once, otherwise I get the error message, "Process has exited, so the requested information is not available".
Once I have closed the process, I would then re-launch Internet Explorer. e.g.
process = Process.Start(...);
But this didn't work. I also tried nulling the Process variable before calling the Process.Start() method, but this didn't work.
I also tried using process.Kill(), but this caused problems too.
What is the correct way to do this?
UPDATE: Code
Process Browser;
[TestInitialize]
public void TestSetup()
{
Browser = TestBase.LaunchBrowser();
...
Browser.WaitForInputIdle();
Browser.CloseMainWindow();
Browser = null
Browser = Process.Start("IExplore.exe", ...);
}
[TestMethod]
public void MyTest()
{
// do things
Browser.Kill();
Browser = Process.Start("IExplore", "www.adifferentwebpage");
}
[TestCleanup]
public void TestCleanup
{
Browser.Kill();
}

Answer 1

I suggest to create another process without reusing the same variable.
Encapsulate your code inside a using statement to properly close and dispose the process variable
using(Process process = new Process())
{
// do you stuff
process.Start(.....);
process.CloseMainWindow();
}
Also remember that calling CloseMainWindow doesn't gurantees that the process will close. It only sends a request to close to the main window of the process. If the application ask for user confirmation before quitting it can refuse to quit.

Answer 2

I found a solution, but it only applies to those who have access to the Coded UI test DLL's (which I believe comes with Visual Studio Ultimate and Premium).
Therefore I will change the tags on the question.
If you create a Coded UI test project, these DLL references will already be there, but this using reference is what you need:
using Microsoft.VisualStudio.TestTools.UITesting;
To create a browser window:
BrowserWindow browser = BrowserWindow.Launch(new System.Uri("www.whatever.com"));
To close:
Browser.Close();
This worked no matter how many times I needed to relaunch the browser. This API also includes a multitude of other handy features like the ability to delete cookies, change the URL of the current browser, resize the window etc.