How to use the C# RichTextBox

The RichTextBox in C# is a text editing control that can be used to display and edit content in rich text format. Here are some common usage scenarios:

1. The text in the richTextBox has been set to “Hello, World!”.
2. Set the font and size:
   richTextBox.Font = new Font(“Arial”, 12); // Set the font to Arial and font size to 12.
3. Set text style:
   richTextBox.SelectionFont = new Font(richTextBox.Font, FontStyle.Bold); // Make selected text bold
   richTextBox.SelectionColor = Color.Red; // Make selected text red
4. Add image:
   Image image = Image.FromFile(“image.jpg”);
   Clipboard.SetImage(image);
   richTextBox.Paste(); // Paste the image from the clipboard into the RichTextBox
5. Search and replace text:
   int index = richTextBox.Find(“World”); // Search for “World” in the text and return the index of the first match
   if (index >= 0)
   {
   richTextBox.Select(index, “World”.Length); // Select the matching text
   richTextBox.SelectedText = “Universe”; // Replace the selected text with “Universe”
   }
6. Save and load text:
   richTextBox.SaveFile(“document.rtf”); // Save text to an RTF file
   richTextBox.LoadFile(“document.rtf”); // Load text from an RTF file

These are just some common uses of RichTextBox; you can implement more complex functionalities by using other methods and properties according to your actual needs.