Article ID: 166712
Article Last Modified on 1/19/2007
APPLIES TO
- Microsoft Access 97 Standard Edition
This article was previously published under Q166712
Moderate: Requires basic macro, coding, and interoperability skills.
SYMPTOMS
In Microsoft Access 97, you may receive one of the following error messages when you try to set or use some form and report properties in your database:
NOTE: The same action that causes the error message in Microsoft Access 97 may not produce an error in earlier versions of Microsoft Access.
CAUSE
Some properties that returned values of Variant data type in earlier versions of Microsoft Access are strictly typed as non-Variant data types in Microsoft Access 97.
RESOLUTION
Verify that no errors exist in your application by doing the following:
- Compile and save all modules in your database.
- Check for run-time errors when you run your code.
STATUS
This behavior is by design.
MORE INFORMATION
Some form and report properties that returned Variant values in earlier versions of Microsoft Access now return strict data types. The term for this is "strong typing" or "strict typing." Visual Basic for Applications code in your database that includes strictly-typed properties runs faster in Microsoft Access 97; however, when you convert a database from an earlier version of Microsoft Access to Microsoft Access 97, you must verify that no errors are introduced in your application by the new data types.
Following are lists of properties that returned Variant values in earlier versions of Microsoft Access, but return specific data types in Microsoft Access 97.
Properties Returning String Data Types
AfterDelConfirm InputMask OnGotFocus OnRetreat AfterInsert Item OnInsert OnTimer AfterUpdate MenuBar OnKeyDown OnUnload BeforeDelConfirm OLEClass OnKeyPress OnUpdated BeforeInsert OnActivate OnKeyUp OrderBy BeforeUpdate OnApplyFilter OnLoad Picture Caption OnChange OnLostFocus RecordSource Class OnClick OnMenu RowSource ColumnWidths OnClose OnMouseDown RowSourceType ControlName OnCurrent OnMouseMove ShortcutMenuBar ControlSource OnDblClick OnMouseUp SourceDoc ControlTipText OnDeactivate OnNoData SourceItem DatasheetFontName OnDelete OnNotInList SourceObject DefaultValue OnEnter OnOpen StatusBarText Filter OnError OnPage Tag Format OnExit OnPrint ValidationRule FormName OnFilter OnPush ValidationText HelpFile OnFormat OnResize
Properties Returning Boolean Data Types
AddColon Dirty AutoLabel HideDuplicates Cancel RepeatSection
Properties Returning Double Data Types
CurrentX ScaleLeft CurrentY ScaleTop ScaleHeight ScaleWidth
Properties Returning Integer Data Types
DatasheetGridlinesBehavior FillStyle OLETypeAllowed DrawMode LabelAlign RunningSum DrawStyle LabelX ScaleMode DrawWidth LabelY
Properties Returning Long Data Types
BackColor DatasheetBackColor FillColor BorderColor DatasheetForeColor ForeColor CurrentRecord DatasheetGridlinesColor
Steps to Reproduce Behavior
The following example demonstrates the error message that you receive if you try to set the ControlSource property of a text box control to Null in Microsoft Access 97. The ControlSource property is typed as a String data type in Microsoft Access 97; you receive an error because String data types cannot contain Null values.
- Start Microsoft Access 97 and open the sample database Northwind.mdb.
- Open the Customers form in Design View.
Add a command button to the form:
Command button: Name: Command0 OnClick: [Event Procedure]
Set the OnClick property of the command button to the following event procedure:
Private Sub Command0_Click() Me![CompanyName].ControlSource = NULL End Sub
- Switch the Customers form to Form view, and click the Command Button. Note that you receive the following error:
REFERENCES
For more information about strict typing, search the Help Index for "Type Mismatch (error message)."
For more information about data types, search the Help Index for "data types, described."
For more information about this and other issues related to converting databases from earlier versions of Microsoft Access, please see the following article in the Microsoft Knowledge Base for instructions on obtaining the Microsoft Access 97 Conversion white paper:
151193 ACC97: MS Access 97 Conversion White Paper Available in Download Center
Additional query words: object single byte currency date int
Keywords: kbprb KB166712