How to insert Math Equation in RichTextBox in C#

Since the RichTextBox control doesn't natively support MathML, LaTeX, or MathType directly, you'll need to use workarounds.

How to insert Math Equation in RichTextBox in C#?

Open 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 a RichTextBox control from the Visual Toolbox onto your form designer, then design your form as shown below.

You can render your equations as images (e.g., using LaTeX renderers or MathML libraries) and then insert the images into the RichTextBox.

The RichTextBox control supports RTF, which can include custom data like equations formatted in MathType or other tools.

private void InsertEquationButton_Click(object sender, EventArgs e)
{
    // Replace this with actual LaTeX rendering or MathML to an image
    Bitmap equationImage = Image.FormFile("C:\\equation.jpg");
    Clipboard.SetImage(equationImage);
    richTextBox.Paste();
}

Use MathType or a similar tool to generate RTF content with equations.

You need to add a math equation to wordpad -> save to .rtf file, then copy your file to resource of your project.

Add code to button click event handler as shown below.

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

Load the RTF content into the RichTextBox using the RichTextBox.SelectedRtf property.

// c# insert equation
private void InsertEquation()
{
    // Example of RTF content with an equation (replace with actual RTF containing MathType)
    string equationRtf = @"{\rtf1\ansi This is an equation: {\field{\*\fldinst EQ \f(mc^2)}}.}";
    richTextBox.Rtf = equationRtf;
}

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