OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\PrSpecial\MDB\DBProcessi001.mdb;Persist Security Info=True;Jet OLEDB:Database Password=pippo");

strQuery = "SELECT * FROM AnClienti";

DataSet myDataSet = new DataSet();

OleDbCommand cmd = new OleDbCommand(strQuery, con);
OleDbDataAdapter myDataAdapter = new OleDbDataAdapter(cmd);

con.Open(); 
myDataAdapter.Fill(myDataSet);

con.Close();

dataGridView1.DataSource = myDataSet.Tables[0];