use of connections to database

I have a page where I am doing 2 seperate queries to an access database. My question is should I close the connection after the first query and the re-open it.....or do I just leave it open, then close at the end.
What is the best and efficient way to do this?

// Connect to the Access database using a query to get all the data from the table.
OleDbDataAdapter myAdapter = new OleDbDataAdapter("SELECT * FROM table1);

// Create and fill a DataSet.
DataSet ds = new DataSet();                  
myAdapter.Fill(ds);

connection.Close(); ////////////////////the magic line, should I have this here or not?

// Bind MyRepeater to the DataSet.                   
MyRepeater.DataSource = ds;
MyRepeater.DataBind();

//Use a variable to hold the SQL statement.
string selectString = "SELECT * FROM [table2]";

//Open the connection.
connection.Open();

//Create an OleDbCommand object.
OleDbCommand cmd = new OleDbCommand(selectString,connection);

OleDbDataReader reader = cmd.ExecuteReader();

while(reader.Read())
{                              
      this.field1.Text = reader["field1"].ToString();
      this.field2.Text = reader["field2"].ToString();
}

//Close the reader and the related connection.
reader.Close();
connection.Close();

I look forward in hearing thoughts on this.