You can skip that part, if you are only interested in internal Injection

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Execute Button

Api.External.execute("string script");

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Sample Button event

private void ExecuteButton_Click(object sender, EventArgs e) {
	Api.External.execute("print('Hello, World')");
}
its recommended to put richtextbox1.Text instead of a script.
private void ExecuteButton_Click(object sender, EventArgs e) {
	Api.External.execute(richTextBox1.Text);
}
While the name of the Editor richTextBox1 is.