c# datagridview 和 链接数据库例子

string conn_sring = "Data Source=127.0.0.1;Initial Catalog=atm;Persist Security Info=True;User ID=sa;Password=123";
DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.SqlClient");
DbConnection conn = factory.CreateConnection();
conn.ConnectionString = conn_sring;
conn.Open();
DbDataAdapter adapter = factory.CreateDataAdapter();
DbCommand command = conn.CreateCommand();
command.CommandText = "select * from [user]";
command.CommandType = CommandType.Text;
adapter.SelectCommand = command;
DataTable ds = new DataTable();
adapter.Fill(ds);
this.dataGridView1.AutoGenerateColumns = true;
this.dataGridView1.DataSource = ds;
this.dataGridView1.DataMember = "user";