How To Query And Show The Result In A Form

I am an beginner in VC#2005,

my question is:

I connect a table and transtorm to WM5.0 (PDAphone),

I don't know how to show the result of my query,

EX:

table1,(two column: name , phoneNo)

private void button1_Click(object sender, EventArgs e)
{
SqlCeConnection cn = null;
try
{
cn = new SqlCeConnection("Data source=\Programs files\sqltest1\sqlPDA.sdf");


SqlCeCommand cmd = new SqlCeCommand();
cmd.CommandType = CommandType.Text;
cmd.CommandText = "select * from Table1 where phoneNo='0922123456'";


SqlCeDataAdapter da = new SqlCeDataAdapter();
DataSet ds = new DataSet();
da.SelectCommand = cmd;

}
finally
{
if (cn.State != ConnectionState.Closed)
{
cn.Close();
}

}
}

there is nothing happen, please help me.

thanks