KNOWLEDGE BASE

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[PRB] Object variables inside Form_Initialize and UserControl_Initialize events are always Nothing
[PRB] The Scripting.Dictionary object doesn’t work with Enum keys
[PRB] The ADODC Data control doesn’t work with server-side cursors that use Access databases
[PRB] The ClientSize property of a form can return an incorrect value
[PRB] The focus doesn’t go to the parent window when closing a modal form
[HOWTO] Expose arrays with nonzero lower index to COM clients
[HOWTO] Create custom labels in the tab portion of an SSTab control
[BUG] Testing Err after invoking Format6 method
[HOWTO] Implementing the Enter/Leave event handlers for a control array
[PRB] The default font for VB6Printer object can be different from VB6
[HOWTO] Solve “Number of indices exceeds the number of dimensions of the indexed array” compilation errors caused by Redim statements that change the array rank
[HOWTO] Leverage naming conventions to assign a specific type to implicitly-declared variables
[BUG] #IF statement that use compiler constants starting with “vb”
[PRB] Form_Load events in default form instances
[INFO] Runtime errors in Form_Load events in 64-bit apps
[PRB] Omitting default values in INSERT statements with Access
[INFO] Converted DataEnvironment instances open the connection only when needed
[INFO] Diagnose problems related to .NET assemblies that can’t be found or aren’t loaded correctly
[PRB] .NET 4.0 TlbImp tool generates wrong wrappers for optional Boolean parameters
[HOWTO] Have VB Migration Partner correctly locate TlbImp and other .NET SDK tools
[INFO] It’s impossible to set the initial tab in an SSTab control
[HOWTO] Improve performance of migrated .NET applications
[INFO] VB Migration Partner requires that current user has write permission on C:\ root folder
[HOWTO] Create an instance of the VB6ImageList control at runtime
[INFO] .NET behaves differently from VB6 if you disable a checked OptionButton control in Form_Load event handler
[INFO] The AutoDispose pragma doesn’t account for multiple assignments to same variable
[PRB] The VB.Global object isn’t migrated
[PRB] Manually invoking the Paint event handler may not deliver the expected results
[PRB] Accessing a control from the Initialize event handler causes a NullReference exception
[HOWTO] Migrate binary properties of nested user controls
[PRB] Invoking an action stored procedure via a Command object may throw an exception
[INFO] The OpenSchema method returns a client-side recordset
[INFO] Main ADOLibrary limitations
[INFO] Form Left and Top properties not correctly migrated if StartupPosition is Manual
[PRB] Passing a ParamArray to another method
[PRB] “Class” suffix may cause compilation errors
[HOWTO] Leverage .NET TextAlign property with command, checkbox, and option button controls
[INFO] Minor differences between CommonDialog, Printer, Line, and Shape VB6 classes and their implementation in CodeArchitects.VBPowerPack.dll
[INFO] VB Migration Partner uses the Line, Shape, and Printer classes in Microsoft VB PowerPacks
[PRB] Setting the current tab in a SSTab control brings the input focus to the control
[PRB] A migrated form doesn’t fire the Paint event
[HOWTO] Use controls from VB Migration Partner’s support library on a standard .NET form
[HOWTO] Modify migrated projects to use CodeArchitects.VBPowerPack.dll
[HOWTO] Reduce flickering when loading or resizing a form with many controls
[INFO] Migrated .NET code might not work in partially-trusted applications
[PRB] The application stops with the “ActiveX control is windowless. Windowless ActiveX controls aren’t supported” error message
[PRB] Can’t use Tab key to move the focus to a DataGrid ActiveX control
[INFO] Controls in the support library can’t be dropped on a standard VB.NET form
[PRB] Errors when re-opening modal, default forms that host an ActiveX control
[PRB] Common problems when generating an ActiveX wrapper with AxWrapperGen
[HOWTO] Using migrated .NET DLLs from VB6, ASP, and other COM clients
[PRB] Drag-and-drop operations inside a ListBox control may deliver fake results
[PRB] SmallChange property can’t be higher than LargeChange
[INFO] Minor differences among different versions of Microsoft Windows Common Controls library
[PRB] Compatibility problems with MS Build
[PRB] The FileLineInput6 statement uses CR-LF pairs as delimiters
[PRB] A form loaded with Load method might cause errors in its Unload event handler
[PRB] Control events don't fire
[PRB] VB Migration Partner generates incomplete classes
[PRB] Forms containing an ImageList control don’t display at design-time after updating the CodeArchitects.VBLibrary DLL.
[HOWTO] Define a more reliable Ambient.UserMode property
[PRB] Invoking the Show method of MDI child forms containing one or more ActiveX controls might not fire the Load event
[PRB] Top property of controls hosted inside an SSTab control is relative to TabPage border
[PRB] Setting the Visible=False for a Frame may cause spurious GotFocus, LostFocus, and Validate events
[PRB] ScaleHeight and ScaleWidth properties aren’t correctly serialized at design-time
[HOWTO] Write an extender DLL that can manipulate design-time properties of converted controls
[PRB] The MsgBox, InputBox, and common dialogs cause spurious LostFocus and GotFocus events
[HOWTO] Skipping one or more methods when applying the PreProcess or PostProcess pragmas
[INFO] How to migrate the PictureDn, PictureUp, and PictureDisabled properties of SSCommand and SSRibbon controls
[HOWTO] Change the value of a given property of all controls of specified type or name
[PRB] Setting the Font property inside a Paint event causes an endless loop
[HOWTO] Check an item of a ListBox with Style=CheckBoxes with a single mouse click
[PRB] Setting the Font property at runtime causes an unexpected Paint event which may freeze the application
[PRB] Mouse custom cursor in drag-and-drop operations with ActiveX controls doesn’t work correctly
[HOWTO] Speed up string concatenation
[PRB] “Classic” (VB3-style) drag-and-drop stops working
[PRB] Label and Image controls appear in front of other controls
[PRB] The migrated application takes too long at loading its first form
[PRB] The Line property of output TextStream always returns 1
[PRB] Removing an item from a single-selectable ListBox selects the previous item
[INFO] Minor differences between VB6 and VB.NET SSTab controls
[INFO] DoEvents6 calls can cause weird user interface behaviors
[PRB] An MDI Child form can mistakenly display a menu bar
[PRB] The CLS method fails to refresh child controls on the form
[PRB] Can’t mix VB graphic properties and GDI native calls
[PRB] The VB.NET application hangs on the splash screen or terminates earlier than expected
[PRB] Multiple or missing Paint events
[PRB] Assignments to Font properties generate runtime errors in late-bound mode
[HOWTO] Modify the behavior of methods and classes in VB.NET library and VB Migration Partner support library
[PRB] Menus on MDI child forms doesn’t replace the toplevel menu of the MDI parent form
[PRB] VB Migration Partner fails to recognize a reference to a VB6 project
[INFO] Minor differences between VB6 and VB.NET controls belonging to the Threed (ActiveTreedPlus) control library
[PRB] Out of memory exceptions when converting very large projects
[PRB] The Data control may fail when accessing a non-Access data source
[HOWTO] Convert weak object references and the ObjPtr keyword to VB.NET
[HOWTO] Using the NGEN tool to speed up the startup phase of a migrated .NET application
[HOWTO] Migrating VB6 reports to NET
[PRB] Structures containing DBCS strings may cause exceptions when passed to an external (Declare) method
[PRB] Form-level variables in default forms don’t retain their values between calls
[PRB] Column formatting via StdDataFormat objects doesn’t work for DataGrid controls
[PRB] Assigning a StdDataFormat object to the DataFormat property of an ADODB.Field causes runtime errors
[PRB] Most VB.NET methods don’t work well with strings that contain ASCII 0 characters
[HOWTO] Incrementally migrate a large VB6 project and avoid the “Maximum number of errors has been exceeded” message
[HOWTO] Generate auto-implemented properties for Visual Basic 2010
[PRB] Closing a form causes the ObjectDisposed exception
[PRB] The Len6 method can return invalid values when applied to a structure containing fixed-length strings
[PRB] Serializable properties in UserControls using system objects may crash Visual Studio
[HOWTO] Create a report with all the migration issues and warnings
[PRB] ScrollBar controls ignore the LargeChange property
[PRB] ObjectDisposed exception where re-opening a closed form
[PRB] VB Migration Partner may stop when converting VB6 apps that reference a .NET DLL
[PRB] VB6 and VB.NET store arrays into Collection objects in different ways
[HOWTO] Replace Collection with the VB6CollectionVariant type
[PRB] The IsArray method returns False with unitialized array stored in Object variables
[PRB] UserControl classes don’t raise the InitProperties, ReadProperties and WriteProperties events
[PRB] NullReference exception in Form_Initialize
[HOWTO] Reduce flickering in graphic operations
[PRB] Scrollbars in MDI forms are always visible
[PRB] Elements of control arrays can’t be referenced before being created
[PRB] Hotkeys in SSTab caption work only if the form’s KeyPreview property is set to True
[HOWTO] Fix ReDim statements that change the rank of an array
[INFO] Minor differences between VB6 and VB.NET implementation of DDE
[PRB] Compilation errors with classes or usercontrols that expose events with same name as other members and that are used to define an interface
[INFO] The Erase statement doesn’t work well with VB6 static arrays
[PRB] Arrays held in Variant and Object variables are converted in a special way
[PRB] Connection and Recordset objects should be closed explicitly
[PRB] The Execute method of the ADODB.Connection object can create a spurious Recordset object
[HOWTO] Get rid of warnings related to Screen.MousePointer property
[HOWTO] Determine if unsupported members throw an exception at runtime
[INFO] Minor differences between VB6 and VB.NET ImageList controls
[PRB] The list area of a DataCombo or DataList control isn’t automatically updated
[PRB] The data source of a bound control isn’t updated if the control’s value is modified via code
[INFO] How VB Migration Partner implements drag-and-drop features
[PRB] Stand-alone UserControl, UserDocument, and PropertyPage keywords might not be converted correctly
[PRB] Structures can’t have the same name as other members in VB.NET
[PRB] Compilation error when implementing an interface that defines a collection class
[INFO] How VB Migration Partner deals with late-bound calls
[PRB] Private UserControls aren’t loaded with Controls.Add method
[PRB] Disappearing records in client-side ADODB.Recordset with batch optimistic lock
[PRB] ActiveX controls aren’t migrated correctly
[INFO] All ListBox and Frame controls in an array must have same style
[PRB] Default member isn’t resolved for arguments of IIF and Choose methods
[INFO] UDT fields accessed via a VB6Variant variable are readonly
[HOWTO] Convert byte-oriented string functions
[HOWTO] Convert VB6 files that are shared among projects
[HOWTO] Leverage the features of native .NET controls
[PRB] .NET applications crash with “Unable to create ActiveX object” error
[HOWTO] Ensure that properties with both Property Let and Property Set are translated correctly
[HOWTO] Retrieving a reference to the actual ActiveX control wrapped in a class generated with AxWrapperGen
[HOWTO] Improve code generation with Variant variables and parameters
[PRB] PictureBox, Frame and other container controls don’t correctly process the Tab key if TabStop=False
[PRB] The VB.NET application can’t compile because of an ”'AddressOf' expression cannot be converted to 'Integer' because 'Integer' is not a delegate type” error
[PRB] The VB.NET application can’t compile because a constant in a Structure is ambiguous between two modules
[HOWTO] Apply pragmas only to variables of specific types
[PRB] VB.NET controls are taller than the original VB6 control
[HOWTO] Optimize startup time in N-tier applications
[HOWTO] Avoid reentrancy problems in free-threaded .NET components
[PRB] The Default and Cancel properties of a VB6UserControl object don’t behave like in VB6
[HOWTO] Fix VB6 client applications that reference a COM DLL that has migrated to VB.NET using binary compatibility
[PRB] Members in COM libraries might be missing or raise unexpected errors
[INFO] Minor differences between VB6 and VB.NET Command controls
[INFO] Binary properties of a few controls aren’t migrated correctly
[PRB] The vbDefaultButton4 constant might not be converted correctly
[HOWTO] Execute multiple instances of VB Migration Partner
[HOWTO] Solve issues related to Null values in database fields
[HOWTO] Terminate the migration when a warning message is emitted
[PRB] A FileGet6 or FilePut6 method throws an exception while attempting to read or write a User-Defined Type variable
[PRB] Errors when doing unit testing or using reflection to explore the support library
[HOWTO] Use different versions of same COM type library or ActiveX control
[HOWTO] Get rid of the "Class" suffix used for COM classes
[HOWTO] Assign a specific data type when the As clause is missing
[PRB] .NET arrays are copied using "shallow" semantics
[HOWTO] Permanently display label and button accelerators
[PRB] WLOption controls ignore the Group property
[INFO] You need a runtime license for RDO and for ActiveX controls when running on a computer on which VB6 isn’t installed
[INFO] The End keyword is converted as ApplicationExit6
[HOWTO] Using the SetType pragma with optional parameters
[INFO] .NET floating point divisions never raise Division-by-zero errors
[INFO] VB Migration Partner generates signed interop assemblies
[PRB] The DAO RepairDatabase method causes a compilation error
[HOWTO] Avoid Option Explicit Off in generated VB.NET files
[INFO] VB Migration Partner doesn’t support references to external EXE projects
[PRB] PreProcess or PostProcess pragma can make VB Migration Partner to hung
[HOWTO] Limit the scope of PreProcess and PostProcess pragmas
[HOWTO] Convert from OLE types to .NET types
[HOWTO] Temporarily disable pragmas for debugging purposes
[HOWTO] Convert While loops into Do loops
[HOWTO] Optimize Boolean expressions using PostProcess pragmas
[PRB] Changing the type of a variable causes a Type Mismatch compilation error
[PRB] Pragmas related to arrays might not work if applied to a ReDim statement
[PRB] A nonexisting property is generated for a control in the *.Designer.vb file
[PRB] A locked EXE or DLL file causes the migration process or compilation command to fail
[PRB] The VB.NET application ends with a fatal exception when the splash screen closes
[PRB] Conversion fails with a "Project item name not found" error
[INFO] Minor differences between VB6 and VB.NET MSChart controls
[INFO] Minor differences between VB6 and VB.NET TabStrip controls
[INFO] Controlling the LostFocus and Validate event sequence
[INFO] Controlling the GotFocus and MouseDown event sequence
[INFO] GotFocus and LostFocus events in UserControls
[HOWTO] Generate Visual Studio 2008 and 2010 projects
[INFO] Minor differences between VB6 and VB.NET DataGrid controls
[HOWTO] Modify project-level options in .NET programs
[HOWTO] Enforce project-level Option Strict Off setting in VB.NET programs
[HOWTO] Change the base class of a VB.NET class
[INFO] Minor differences between VB6 and VB.NET DriveListBox, DirListBox, and FileListBox controls
[HOWTO] Deal with Null, Empty, and missing values
[INFO] Minor differences between VB6 and VB.NET RemoteData controls
[PRB] Selecting the contents of a TextBox when the control gets the input focus doesn’t work in VB.NET
[HOWTO] Move a control over a toolbar at runtime
[INFO] Minor differences between VB6 and VB.NET Toolbar controls
[PRB] Assignments to the ListView.SelectedItem property are ignored if the control isn’t visible
[PRB] The Load event of a form doesn't fire when you access its property or control from another form
[INFO] Fields are restored in a different way if an error occurs with a Data control
[INFO] Minor differences between VB6 and VB.NET RichTextBox controls
[INFO] Minor differences between VB6 and VB.NET DataCombo controls
[INFO] Minor differences between VB6 and VB.NET TreeView controls
[INFO] Minor differences between VB6 and VB.NET DTPicker controls
[INFO] Minor differences between VB6 and VB.NET MonthView controls
[INFO] Minor differences between VB6 and VB.NET DataList controls
[INFO] Minor differences between VB6 and VB.NET UpDown controls
[INFO] Minor differences between VB6 and VB.NET StatusBar controls
[INFO] Minor differences between VB6 and VB.NET ImageCombo controls
[PRB] A reference to the Controls collection isn’t converted to Controls6
[INFO] VB Migration Partner setup fails if VB6 isn’t installed
[PRB] Limitations in the conversion of #If blocks
[INFO] Default methods with arguments are converted to read-only properties
[INFO] Converted .NET applications target 32-bit CPUs by default
[INFO] Minor differences between VB6 and VB.NET ListView controls
[HOWTO] Create references to .NET assemblies with absolute path
[PRB] VB.NET doesn’t support implicit conversions in Const statements
[PRB] VB.NET doesn’t allow to close an ADO Connection while a transaction is active
[INFO] OLE_COLOR type is converted to System.Drawing.Color
[INFO] Two .NET project can't coexist in the same directory
[PRB] VB Migration Partner is unable to run Visual Studio
[INFO] HitTest method of the TreeView control can return different values in VB.NET
[HOWTO] Transform “Not x Is y” expressions into “x IsNot y” expressions
[PRB] Conversion fails with an "Unable to find ResToResx.exe tool" error
[PRB] DTPicker controls display their content using the LongDate format
[HOWTO] Reduce runtime errors caused by null strings
[PRB] Calls to GetOpenFileName API method returns trimmed string
[INFO] Negative values for ScaleWidth and ScaleHeight properties cause incorrect output in Microsoft Vista
[HOWTO] Replace App6 properties with native VB.NET members
[INFO] VB.NET property values passed to a ByRef parameter can be modified
[PRB] Mouse event aren’t received by transparent Image and Label controls
[PRB] Image controls whose Picture property is Nothing aren't transparent
[PRB] Using an array of UDTs causes a compilation error or doesn’t work correctly at runtime
[PRB] The ScriptControl can’t interact with classes that aren’t visible to COM
[PRB] Objects returned from COM methods may cause an InvalidCastException error
[HOWTO] Avoid compilation errors caused by unsupported designers
[HOWTO] Show UPGRADE_ISSUE comments in the Task List window
[BUG] The VB6Printer object doesn’t print in landscape mode
[HOWTO] Implement functions that return arrays with nonzero LBound
[HOWTO] Exclude portions of VB6 code from the migration process and replace it with custom .NET statements
[HOWTO] Move the declaration of a variable into a For or For Each loop
[HOWTO] Work with auto-instancing arrays
[PRB] The system hangs when using SendKeys to simulate key presses in an external application
[PRB] A reference to a COM type library is missing
[PRB] Output from the Print statement appears slightly different from the original VB6 application
[PRB] The VB.NET application throws a NullReference exception (or some other unexpected error) during the initialization phase
[HOWTO] Migrate VB6 applications that use window subclassing
[PRB] Passing an enumerated value to a Boolean argument throws an exception when the method returns
[INFO] DIB images are copied and pasted as regular images
[INFO] Properties may be migrated without any warning related to VB6’s ByRef parameters being converted to VB.NET’s ByVal parameters
[PRB] Common issues when converting VB6 applications that use type libraries
[PRB] Get# and Put# statements might not behave as expected
[PRB] Code that references a VB6DataGrid column by its string key may not work in the migrated VB.NET program
[INFO] DBGrid control isn’t supported
[PRB] DataGrid and MSHFlexGrid controls don’t work as expected and/or throw exceptions
[PRB] The DataBindings property of a bound user control isn’t migrated
[INFO] adDBFileTime enum values are converted to ADODB_DataTypeEnum_adDBFileTime constants
[INFO] Some properties of VB6DataGrid control can’t be modified from inside Visual Studio’s property window
[PRB] Changing properties of the data source associated with a DataGrid control can throw an exception
[PRB] Data classes might need manual adjustments
[INFO] Multithreaded VB6 applications don’t retain their multithreading behavior
[INFO] Using the VBMigrationPartner_Support module
[PRB] The .NET application doesn’t compile because of a “Number of indices exceeds the number of dimensions of the indexed array” compilation error
[PRB] The VB.NET application doesn’t compile because of a “Method XYZ not found” compilation error
[PRB] The DataGrid’s SelColChange event may fire unexpectedly
[PRB] The migrated VB.NET has a “Name ‘xyz’ is not declared” compilation error
[INFO] ADO-related code in the migrated VB.NET application might not behave like the original VB6 code
[PRB] The VB6 form has border, but the migrated VB.NET form hasn’t
[PRB] A call to a Windows API Declare returns a string filled with spaces
[PRB] VB6 applications that use window subclassing or other API callback methods throw a CallbackOnCollectedDelegate exception
[PRB] DAO and RDO Data control may not update bound controls when record position changes
[INFO] Classes and user controls generated by VB6 Data Object Wizard aren’t supported
[PRB] Passing an ADO read-only property to a ByRef argument causes a COMException
[PRB] The migrated VB.NET application can’t compile because of the error “ ‘XYZ’ is already declared in this enum”
[PRB] Passing ADOX properties to ByRef argument may cause unexpected runtime exceptions
[BUG] The Validate event may not fire for the Data and RDO Data control
[PRB] Assigning the ActiveConnection and Source properties of an ADODB.Recordset object may cause a runtime error
[HOWTO] Solve syntax errors in ADODC event handlers
[PRB] Deleting a Toolbar, ListView, or StatusBar control prevents the form from loading in Visual Studio designer
[INFO] The .NET Toolbar control can’t contain standard controls
[PRB] Using the hDC property causes an InvalidOperationException error
[PRB] Controls in migrated VB.NET forms may be hidden by other controls
[PRB] Setting the TabIndex property in VB.NET doesn’t affect the TabIndex of other controls
[PRB] The ListView’s background image doesn’t migrate correctly
[PRB] The UpDown control can affect the wrong property of its buddy control
[PRB] Arrays of menu items can throw an exception if items are destroyed too early
[PRB] The DTPicker control doesn’t accept dates earlier than 1/1/1753
[PRB] .NET collections can’t be modified while inside a For Each loop
[PRB] Removing an item from a multi-selectable ListBox resets ListIndex property
[PRB] Assignments to VB6 Form’s Left and Top properties are ignored
[PRB] Math operations on Variants cause an Overflow exception
[PRB] Disabled controls and read-only TextBox controls appears with grayed background
[INFO] Double-clicking on a control array element at design-time creates a brand new event handler
[INFO] Timers are disabled inside VB6 IDE when a MsgBox or InputBox statement is active
[PRB] Transparent VB6 Label controls aren’t transparent in the VB.NET application
[INFO] User-defined coordinate systems can have unexpected results
[PRB] Images displayed in TreeView, ListView, and other controls aren’t transparent
[PRB] Replacing a VB6Placeholder control with another control causes an error in the VB.NET designer
[INFO] VB.NET automatically sets the Checked property of the first control in a group of Option buttons
[PRB] PictureBox controls can be cleared unexpectedly or receive spurious Paint events
[INFO] Forms with Line and Shape controls may exhibit a lot of flickering
[PRB] Shape and Line controls aren’t updated correctly
[HOWTO] Speed up execution by removing unnecessary Refresh methods
[PRB] GoSub statements inside For loops and With blocks cause a compilation error
[PRB] Structures with same name may be generated in the same .NET namespace
[PRB] The font of a control changes unexpectedly at runtime
[PRB] Property references in a form might not match property names in a UserControl
[HOWTO] Reduce compilation errors caused by late binding or undetected conversions
[HOWTO] Deal with Null values in If statements
[PRB] Properties of the MSChart control might not be migrated correctly
[HOWTO] Speed up For Each loops that iterate over the Controls collection
[HOWTO] Simplify code produced for UserControl classes
[HOWTO] Determine the font used for forms and controls
[HOWTO] Ignore fatal runtime errors
[INFO] Unsupported ActiveX controls
[HOWTO] Apply ByVal keyword to unassigned by-reference parameters
[HOWTO] Create an empty directory under the application’s folder
[INFO] .NET doesn’t support methods with same name as events
[HOWTO] Handle compilation errors caused by name collisions
[BUG] The MouseIcon isn’t migrated for MMControl and MSHFlexGrid controls
[PRB] VB.NET forms don’t display the size grip handle
[PRB] Graphic output is cleared when the form becomes visible
[PRB] A form behaves differently the second time it is opened
[PRB] SelFontName, SelFontSize, SelBold, SelItalic, SelUnderline, and SelStrikeThru properties of RichTextBox control return Nothing instead of Null
[PRB] Invalid assignments to the Rtf property might not throw an exception
[PRB] MDI child forms don’t become visible
[INFO] Arrays of menu controls can’t contain separators
[INFO] TabStrip and SSTab controls don’t display hotkeys in button captions
[BUG] The Scroll event of the VB6FlatScrollBar control doesn’t fire repeatedly while dragging the indicator
[HOWTO] Iterate over all forms of current application
[PRB] Forms with same name as one of their controls can’t be opened in Visual Studio designer
[PRB] Late-bound code might throw an exception or not work as expected
[INFO] The cdlOFNShareAware flag of the CommonDialog control isn’t supported