There are no components in DLL that can be placed on toolbox

Question

I have a DatePicker custom control that I am trying to add to toolbox. The name of the file is BasicFrame.WebControls.BasicDatePicker.dll and I go through the procedure of right click in Toolbox > Choose Items and then selecting the file after browsing to it under .NET Framework components.

I however get this error message:

There are no components in that can be placed on toolbox

Why do I get this message and how can I resolve it?

Ensure that the control is inhering from the `System.Windows.Forms.Control` class and is `public`. — Kami, Jan 07 '13 at 15:49

score 47 · Answer 1 · answered Dec 19 '13 at 15:31

47

In some cases you can solve this problem with drag and drop:

open Windows explorer and navigate to the DLL
drag the DLL and drop it on Visual Studio in the Toolbox, exactly where you want your components to appear

answered Dec 19 '13 at 15:31

bluish

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Worked here as well. Thanks bluish – Scott Nov 12 '16 at 17:50
Worked in VS2013! Thank you very much. – Oct 28 '18 at 03:10
1

worked in visual studio community 2017! Thanks so much – camino Jan 19 '19 at 20:29

score 9 · Accepted Answer · edited Jul 10 '17 at 08:27

9

Have you checked the visibility of the custom classes?

If you haven't declared them as public they will default to internal and hence aren't exposed to Visual Studio for use.

edited Jul 10 '17 at 08:27

bluish

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answered Jan 07 '13 at 15:57

MikeT

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Hi, How you are doing this, because I have the same problem but I don't know what to do. Thanks – Robert Negreanu Apr 06 '18 at 08:43
look at the classes they should say `public class` if they don't then the dll will hide them – MikeT Apr 06 '18 at 09:12
mine is public by default but still having the same problem. – sam byte Jan 30 '19 at 16:37

score 2 · Answer 3 · answered Feb 11 '18 at 05:49

2

Sometimes drag and drop does not work also. In this case you can

open Windows explorer and navigate to the DLL
copy the dll file and paste it directly on the toolbox tab you wish to place the controls.

answered Feb 11 '18 at 05:49

Bright

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score 0 · Answer 4 · answered Oct 18 '21 at 13:07

Visual Studio 2019 - unable to get VS2019 to recognise a simple user control. I found this was caused by having no parameter-less constructor in the control. As soon as I ensured there was a ctor with no parameters, the control was recognised. I found I was able to use constructor chaining/overloading. Hopefully this will help others having this issue.

score 0 · Answer 5 · answered Jul 25 '23 at 00:15

In my case it was the path to the bin folder of my MyCSharpLibrary.dll project that was too long.

I had to copy my components library a few level up, but it was working before for sure, it been a while since a have rebuild this project perhaps they have add some limitations on path length

There are no components in DLL that can be placed on toolbox

5 Answers5

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