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Display multiple PDF's in windows forms tab control

I am working on a program that will eventually dynamically create tabs to display pdf files, word documents and text files.  To start I am just using an OpenFileDialog to point to a pdf to create a tab and open the file.  This is working for 1 pdf, with one small issue, I have to click on the PDF control in order for the pdf to display, otherwise its just a grey screen.  My bigger problem is when I try to add a second file to the mix.  When I click the button again to add another file the code executes until it reaches "PDFFile.LoadFile(strFileName);".  At that point I get an error, Exception of type 'System.Windows.Forms.AxHost+InvalidActiveXStateException' was thrown.  I've tried to find a solution but the one I keep seeing is I need to put in CreateControl(), which I am already doing.  Has anyone tried to do anything like this and had success?

                TabPage page = new TabPage();

                page.Text = strTabName;

                switch (strControlType)
                    case "pdf":
                        AxAcroPDF PDFFile = new AxAcroPDF();                        
                        PDFFile.Dock = DockStyle.Fill;
                    case "doc":
                    case "docx":
                    case "txt":
            catch(Exception ex)
                var message = ex.Message.ToString();

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C#Adobe Acrobat

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Franck Gaspoz

8/22/2022 - Mon
Franck Gaspoz

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I got the same error when trying to use the src property.

I will look into the AxSHDocVW.AxWebBrowser to see if that meets my needs.

Thank you!
Franck Gaspoz

you're welcome. Hope this will help you.
you will see that this component is really surprising because it works simply as a browser, and also if wished it let you access to the internal document model of ie ( objects, events, ... ). It is now replacing the old ActiveX object provided by Microsoft (1 version of the object for each version of ie), this new one can make running several ie motors.

Thanks for the help, I ended up using the System.Forms.WebBrowser component and it meets my needs!
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Franck Gaspoz

You're welcome. Happy to have helped.