how to assert for any IOException in mstest unit testing c#

I have a unit test that is testing that an IOException is thrown if a file is not found.  I set the test up as follows:

        [TestMethod]
        [ExpectedException(typeof(IOException))]
        public void Throws_Error_When_XMLFileName_Is_Not_Found()
        {
            // Arrange
            var mockHttpContextBase = new Mock<HttpContextBase>();
            var mockHttpServerUtilityBase = new Mock<HttpServerUtilityBase>();
            mockHttpContextBase.Setup(x => x.Server).Returns(mockHttpServerUtilityBase.Object);
            mockHttpServerUtilityBase.Setup(server => server.MapPath(It.IsAny<string>())).Returns(@"C:\SomeDirectory\SomeFile.XML");

            // Act
            LoadServerEnvironmentsFromXML sut = new LoadServerEnvironmentsFromXML(mockHttpContextBase.Object);
            sut.LoadServerList("SomeFile.xml");

            // Assert
            // An exception should be thrown and test will fail if it doesn't
        }

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I don't care if it throws a DirectoryNotFoundException or FileNotFoundException.  How do I test for that?  Right now the test fails because it says a DirectoryNotFoundException was thrown.

Thanks for any suggestions!