// Define the database query    
string mySelectQuery="SELECT Name, Sales FROM REPS;";
// 。。。。。。

// Create a database reader    
OleDbDataReader myReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

// Since the reader implements and IEnumerable, pass the reader directly into
// the DataBindTable method with the name of the Column to be used as the XValue
Chart1.DataBindTable(myReader, "Name");

// Define the database query    
string mySelectQuery="SELECT * FROM REPS;";

// Create a database connection object using the connection string    
OleDbConnection myConnection = new OleDbConnection(myConnectionString);
// Create a database command on the connection using query    
OleDbCommand myCommand = new OleDbCommand(mySelectQuery, myConnection);
myConnection.Open();

// set chart data source - the data source must implement IEnumerable
chart1.DataSource = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

// Set series members names for the X and Y values 
chart1.Series["Series 1"].XValueMember = "Name";
chart1.Series["Series 1"].YValueMembers = "Sales";

// Data bind to the selected data source
chart1.DataBind();

// Create a database reader    
OleDbDataReader myReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

// Since the reader implements and IEnumerable, pass the reader directly into
// the DataBind method with the name of the Column selected in the query    
chart1.Series["Default"].Points.DataBindY(myReader, "GrossSales");

// Create a database reader    
OleDbDataReader myReader = myCommand.ExecuteReader(CommandBehavior.CloseConnection);

// Since the reader implements IEnumerable, pass the reader directly into
//   the DataBind method with the name of the Column selected in the query    
chart1.Series["Default"].Points.DataBindXY(myReader, "Name", myReader, "Sales");