How to copy selected text to the clipboard

This question makes sense to me only if: you are going to return focus after a copy operation in any application to your C# application, and then use the clipboard contents.

The only way I can imagine a solution is by implementing a GlobalSystemHook: see "Processing Global Mouse and Keyboard Hooks in C#" by George Mamaladze[^] which will notify/invoke your C# application in the case of a control-c event.

When notified of that event, you will, then, have to examine the clipboard contents to filter for text-only content ... I assume.

As an alternative to using windows notepad.exe have you considered embedding a notepad clone into your application. I created an exact clone of notepad in C# for exactly this purpose. You can find the source code here:
http://www.simplygoodcode.com/2012/04/notepad-clone-in-net-winforms.html[^]

I understand it ... here and ask you to help in this. How to get a handle to the active window, I know, but while copying the selected text problem (

Hi, you can copy and past selected text to Clipboard by following:

Copy:

<br />
Clipboard.SetText(ListBox1.SelectedItem.ToString());<br />

Past:

<br />
ListBox2.Items.Add(Clipboard.GetText());<br />

Copy the selected text to Clipboard?
Ctrl+C?

You mean to get the data from the Clipboard or what?

Clipboard.SetText ("string") use will not work because "String" is unknown to us, it is allocated in a certain application (eg Notepad)

The key to a solution is analysis of the problem statement. The comments about a clipboard imply a solution. The actual requirement appears to be that the customer wants to open a Notepad window with text in it, where the text is from a text box.

Process notepad = new Process();
     notepad.StartInfo.FileName = @"notepad.exe";
     notepad.EnableRaisingEvents = true;
     notepad.Start();
     notepad.WaitForInputIdle(1000);
     if (notepad.Responding)
     {   //
         // The process/window for notepad.exe is now in the foreground
         //
         System.Windows.Forms.SendKeys.SendWait(MyTextBox1.Text);
      }

Note. This solution was found on the web. It was modified for clarity, i.e. the process object is "notepad" and WaitForInputIdle was reduce to 1 second.

If someone has the time to look into an improvement to this code, then one question is, can the completion of WaitForInputIdle be trapped as an event which invokes the SendKeys.SendWait method?

For Copy Use

Clipboard.SetText

For Paste Use

Clipboard.GetText()