title: How to change the font color of some substring in the textbox in C# Winform?
body: <p>If I want to upload a text file into the textbox and want to highlight certain words with a font color change, i know that i need to write <code>TextBox.ForeColor = Color.SomeColor;</code><br>
  But if i want that <strong>not all the text will be in the <em>same</em> color</strong>, only some Substrings.<br>
  How can I do that?</p>