expression.ControlSource
expression Required. An expression that returns one of the objects in the Applies To list.
Setting
The ControlSource property uses the following settings.
| Setting | Description |
|---|---|
| A field name | The control is bound to a field in a table, query, or SQL statement. Data from the field is displayed in the control. Changes to the data inside the control change the corresponding data in the field. (To make the control read-only, set the Locked property to Yes.) If you click a control bound to a field that has a Hyperlink data type, you jump to the destination specified in the hyperlink address. |
| An expression | The control displays data generated by an expression. This data can be changed by the user but isn't saved in the database. |
You can set the ControlSource property for a control by using the control's property sheet, a macro, or Visual Basic.
You can also set the ControlSource property for a text box by typing a field name or expression directly in the text box in form Design view or report Design view.
For a report, you can set this property by selecting a field or typing an expression in the Field/Expression column of the Sorting And Grouping box. For details, see the GroupLevel property.
In Visual Basic, use a string expression to set the value of this property.
Remarks
For a report group level, the ControlSource property determines the field or expression to group on.
Note The ControlSource property doesn't apply to check box, option button, or toggle button controls in an option group. It applies only to the option group itself.
For reports, the ControlSource property applies only to report group levels.
Forms and reports act as "windows" into your database. You specify the primary source of data for a form or report by setting its RecordSource property to a table, query, or SQL statement. You can then set the ControlSource property to a field in the source of data or to an expression. If the ControlSource property setting is an expression, the value displayed is read-only and not saved in the database. For example, you can use the following settings.
| Sample setting | Description |
|---|---|
| LastName | For a control, data from the LastName field is displayed in the control. For a report group level, Microsoft Access groups the data on last name. |
=Date( ) + 7 |
For a control, this expression displays a date seven days from today in the control. |
=DatePart("q",ShippedDate) |
For a control, this expression displays the quarter of the shipped date. For a report group level, Microsoft Access groups the data on the quarter of the shipped date. |
Example
The following example sets the ControlSource property for a text box named AddressPart to a field named City:
Forms!Customers!AddressPart.ControlSource = "City"
The next example sets the ControlSource property for a text box named Expected to the expression =Date() + 7.
Me!Expected.ControlSource = "=Date() + 7"