Issue with Disposing Adox Object
===

Using ADOX Catalog class I am trying to create an empty Ms Access Database.The code is working fine(as far as I know) and generates the database but when I try to open the database from windows explorer, I am getting the "**Could not use name.accdb ; the file already in use**" error message.I checked the file directory and the name.idb file also was appeared on the directory without opening the database. After I close the C# windows form application the name.idb disappear and I can open the database.
Here is the code which I used to create the database using ADOX.

     
     public void CreateDatabase()
        {
            string databaseName = txtFileName.Text;
            try
            {
                ADOX.Catalog cat = new ADOX.Catalog();

                if (!File.Exists(databaseName + ".accdb"))
                {
                    cat.Create("Provider=Microsoft.Jet.OLEDB.4.0;Data 
                     Source=D:\\" + databaseName + ".accdb" + ";");
                    cat = null;
                }
                cat = null;
            }
            catch (Exception e)
            {
                MessageBox.Show(e.Message, e.Source);
            }
        }

I also tried to dispose the cat object by implementing IDispaosable interface but nothing changed.
Can you please let me know how I can fix this issue which user can open database after generating by the application without closing (Killing)the app?

Regards