Error Message - Can't Load (or Register) Custom Control: 'comdlg32.ocx'

Jan 25, 2012

I'm trying to run a Visual Basic (4.0) program that has run on every flavor of Windows so far. Using Windows 7 I get the following error message:

Can't load (or register) custom control: 'comdlg32.ocx'

This file is in the same directories as it is in a WinXP machine where it runs just fine.


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I have a windows application created using Visual Studios 2005.I recently added a custom control - after I built it, I was able to see it on the toolbox and I placed it from there to my form. All was good till at some point, when I tried to go to the design view of my form that the control is on, I get this error: Could not load file or assembly 'acdbmgd, Version=, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified. [code]I can still run my app and see the control that's on the form, but I'm wondering what this error means? If I rem out the code behind my custom control, I can then view the control on the page again when I design the form.

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Isn't throwing an exception essentially a forced crash of a program in a sense (granted, you get the option of continuing)? Or are exceptions geared specifically for things like data conversion errors and other "things that shouldn't happen", and resume use of MsgBox() and friends for minor user screwups?

Consider the case of where you have a TextBox that is only supposed to accept numeric data (or heck, just a specific set of characters). Barring some other trick that lets you restrict that field (let's just assume it's freeform, programatically), it would seem a bit of a waste to throw new exceptions everytime they type in an invalid character, or even if the error checking doesn't happen until they press a submit button (like on a webpage). Popping a MsgBox() seems more sane in that case.

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Source Error:
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I have used the wizard to upgrade from VB6 to VB2008. I find when I install my program on a new Windows7 computer that it needs comctl32.ocx & comdlg32.ocx. I thought these were just for VB6 and were no longer needed.

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