为什么DataSet不在数据库中创建一个新表?

在数据库中创建新表时遇到了一个小问题。我在DataSet对象中创建了一个新表，但是这个表不是在物理数据库中创建的。表只在缓存中创建。为什么?

我代码:

SqlCeConnection con = new SqlCeConnection(@"Data Source=C:'Projects'ConsoleApplication6'ConsoleApplication6'Data.sdf");
SqlCeDataAdapter sCEdata = new SqlCeDataAdapter("select * from [Cats]", con);
DataSet ds = new DataSet();
sCEdata.Fill(ds);
DataColumn ID = new DataColumn("ID", typeof(int));
ID.AllowDBNull = false;
ID.AutoIncrementSeed = 0;
ID.AutoIncrement = true;
ID.AutoIncrementStep = 1;
ID.ReadOnly = true;
ID.Unique = true;
DataColumn Name = new DataColumn("Name", typeof(string));
DataColumn Owner = new DataColumn("Owner", typeof(string));
DataColumn Note = new DataColumn("Note", typeof(string));
DataTable Cats2 = new DataTable("Cats2");
Cats2.Columns.AddRange(new DataColumn[]{ID, Name, Hozain, Note});
DataRow dr1 = Cats2.NewRow();
DataRow dr2 = Cats2.NewRow();
DataRow dr3 = Cats2.NewRow();
dr1["Name"] = "Pavel"; dr1["Owner"] = "Sergey"; dr1["Note"] = "Starii";
dr2["Name"] = "Gleb"; dr2["Owner"] = "Inga"; dr2["Note"] = "Tupaya";
dr3["Name"] = "Dusia"; dr3["Owner"] = "Olga"; dr3["Note"] = "Zlaya";
Cats2.Rows.Add(dr1); 
Cats2.Rows.Add(dr2); 
Cats2.Rows.Add(dr3);
dr2["Note"] = "Guzelle"; 
ds.Tables.Add(Cats2);
SqlCeCommandBuilder build = new SqlCeCommandBuilder(sCEdata); 
sCEdata.Update(ds);