Develop Reference

Why isn't my Windows Media Player Component being added to my WinForms toolbox in Visual Studio 2019?

Goal.
I am trying to build an auto-captioning software for downloaded videos. I need to watch the video, and listen to the audio, and see what the speech recognizer reads and make any changes that I need to. So I decided that the Windows Media Player Component would work best to watch and playback the video.
Expected Result
I should be able to just go to ToolBox >> Right Click >> Choose Items... >> COM Components >> Check the Windows Media Player checkbox >> OK. and have the component show up in my Toolbox.
Actual Result
The "All Tools" tab expands in my toolbox, but my "axWindowsMediaPlayer1" is nowhere to be found. There is no error message, in fact, I get a box telling me it was added successfully. But again, I try to find it but it is nowhere to be found.
What I've tried
Closing Out of Visual Studio 2019 and reopening it.
Switching from 4.0 to 3.1.
Adding the form from system32 with the Wmp.dll file.
Reseting the Toolbox.
Creating a new tab in the toolbox and trying to add it there (which results in the tab removing itself).
Removing all components from the toolbox (which didn't work any of the times I tried).
Reading the Microsoft's Documentation about adding the Windows Media Player again.

It works for me (VS 2019 v16.9.4; .NETFramework 4.8).
Open Visual Studio 2019
Click
In VS menu, click File
Select New
Select Project
Click Windows Forms App (.NET Framework)
Click Next
Enter desired project name. For Framework, select .NET Framework 4.8
Click Create
Open Solution Explorer
In VS menu, click View
Select Solution Explorer
Open ToolBox
In VS menu, click View
Select Toolbox
Add Windows Media Player to Toolbox
Click All Windows Forms
Select Choose Items
In Toolbox, click "Windows Media Player", hold mouse button down and drag control onto Form1.

Visual Studio not addin custom user control to toolbox

I created a new C# WPF app project in visual studio 2017 and added a user control to the project. Now when I try to add that user control to my main window it doesnt show up in the toolbox.
Ive checked the AutoToolboxPopulate property and it is set to true and Ive rebuilt. Ive tried closing and opening the project and Visual Studio.
What do I need to do to get my controls to show up in the toolbox?

You can try to add it to the toolbox manually
In the toolbox, select the WPF Components. At this time, click Browse, find the dll, add it, and click OK.

I accidentally made a normal user control instead of a WPF user control.

How to add a Custom Windows Forms Control into Visual Studio Toolbox

I want to add my custom control into the VS Toolbox. But I need it to appear in toolbox always when a new project is open. How can I do that?

Create a VSIX package to install the control
You can create a VSIX package to distribute and install user controls to toolbox.
To do so, you can create a VSIX Project and add a Windows Forms ToolBox Control to the project. The control is decorated with a ProvideToolboxControl attribute which determines the tab that the control will appear in. You can pass an existing or a new tab name to the attribute:
[ProvideToolboxControl("Some Tab Name", false)]
public partial class ToolboxControl1 : UserControl
You can also fill the information in .vsixmanifest file. Then when you build the project, it creates a .vsix package file in \bin\debug folder of the project which you can distribute this file. If you run the file, it installs the control in visual studio toolbox.
More information:
Walkthrough: Creating a Windows Forms Toolbox Control
Note:
VS 2013 has a Windows Forms ToolBox Control Project Template under extensibility group of new project window and you can use it to create the project. Starting from VS 2015 you should use VSIX Project template.
Manually Add Control to Toolbox
You can copy the dll of your control to a permanent location. Then right click on ToolBox, for example on general tab, then click Choose Items ... then in Choose Toolbox Items window in .Net Framework Components Tab, click Browse... button and open the dll of your control. Then in the components list, check the control and click OK button. The control will appear under the selected tab. You also can add your own tab simply by right click and choose Add Tab.

How do I add a user control to toolbox?

I want to create a CustomControl in toolbox in my C# application

If your component is within the project, you can have them automatically added to the toolbox. Go to: Tools -> Options -> Windows Forms Designer and enable the "AutoToolboxPopulate" option.
If it's in a separate solution, you can build the control library, and drag and drop on the toolbox to add the components.

Adding Custom UserControl to Visual Studio 2005's Toolbox

I'm using Visual Studio 2005 for a project I'm working on right now. I've created a new, custom control that inherits from 'UserControl'. Now I need to add that control to another Windows Form within the same project. I thought that the IDE would place this custom control into the Toolbox (as I know it's done in the past when I was using Visual Studio 2008), however, it did not. Now, I'm unsure how to get the control added to my form correctly and/or how to make it show up as it should in the Toolbox. The "Auto Toolbox Populate" option under Tools is set to 'True', so I really don't know what else needs to happen at this point. The help of anyone who's had any experience with this would be greately appreciated. Thanks a lot!

You may first build your custom control and create a dll. Then,
Right-click on the Toolbox panel -> Select 'Choose Items' -> Go to '.NET framework components' tab in the 'Choose Toolbox Items' dialog box that appears - > Browse to the dll of your custom user control -> Click OK.
Now the user control will be displaying in your tool box.
Hope this helps...

Try this
Open Solution
Build project
Open your form
Reset the toolbox
Drag the user control from solution explorer to the toolbox
Close the toolbox and all open documents
Open toolbox then the form
User control should appear
worked for me.