How to insert Math Equation to RichTextBox in C#

However, you can use several approaches to include mathematical equations in a RichTextBox

First, Open your Visual Studio, then click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "EquationToRichTextBox" and then click OK

Drag and drop then RichTextBox, Button controls from Visual Toolbox to your form designer, then you can design your form as shown below.

One common approach is to render the mathematical equation as an image and then insert that image into the RichTextBox.

private void InsertEquationImage(string imagePath)
{
    if (File.Exists(imagePath))
    {
        Image image = Image.FromFile(imagePath);
        Clipboard.SetImage(image);
        richTextBox1.Paste();
    }
}

Another approach is to generate the equation as RTF (Rich Text Format) and insert that content into the RichTextBox.

Open your Microsoft Word, then add a simple equation (eg. e=mc2), then save with rtf format.

Next, Add a richtext file to resources, then add code to handle your form as below

private void btnEquation_Click(object sender, EventArgs e)
{
    richTextBox.SelectedRtf = Properties.Resources.Document;
}

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