How do I insert a textbox into this example of taskdialog?

Hi,
I'm starting to learn C# in .NET Core 5, I know something about C# in the .NET Framework... But one of the different things I'm seeing in .NET Core is that in place of the MessageBox there is now the TaskDialog. 
Well, I created a message using the TaskDialog (which can be seen on this link: https://ibb.co/y0Nt5Nx ), except for the textBox which I drew in Paint for the purpose of better illustrating my question.
My question is: how do I insert a textBox and how do I get the value typed by the user in that textBox to be used after that window is closed?

I have searched and read many examples of TaskDialog available on the Web, but I haven't found exactly what I'm looking for, or I'm not quite sure how to apply it to my code below:

var page = new TaskDialogPage()
            {
                Heading = "Input time in minutes:",
                Text = "Input time in minutes:",
                Icon = TaskDialogIcon.ShieldWarningYellowBar,
                Buttons =
                {
                    TaskDialogButton.Close
                }
            };

            var executeButton = new TaskDialogCommandLinkButton("&Execute");
            page.Buttons.Add(executeButton);

            executeButton.ShowShieldIcon = true;