lier(To connect a control to a field or group in the data source so that data entered into the control is saved to the corresponding field or group. When a control is unbound, it is not connected to a field or group, and data entered into the control is not saved); lier(To connect a control to a field or group in the data source so that data entered into the control is saved to the corresponding field or group. When a control is unbound, it is not connected to a field or group, and data entered into the control is not saved)
