Funny Problem (bug?) Using MAX() On SQL Mobile

This sure looks like a bug, but I'm still new...

First I create a simple database:

SqlCeEngine eng = new SqlCeEngine(@"Data Source=My Documents est.sdf");
eng.CreateDatabase();
eng.Dispose();

Then I put something in it:

SqlCeConnection conn = new SqlCeConnection(@"Data Source=My Documents est.sdf");
SqlCeCommand cmd = new SqlCeCommand("CREATE TABLE myTable (ID int, name nchar(10))");
cmd.Connection=conn;
conn.Open();
cmd.ExecuteNonQuery();
cmd.CommandText="INSERT INTO myTable (ID, name) VALUES (1,'bill')";
cmd.ExecuteNonQuery();

Then I try to get the maximum value from the first column.

cmd.CommandText = "SELECT max(ID) FROM myTable";
int index = (int)cmd.ExecuteScalar();

At this point I get an InvalidCastException raised. Using the datareader to extract the value produces the same exception, however I can go through the Query Analyzer on the device and execute the query and it comes out fine...???

This has really got me confused. Any thoughts?