Need to make string bold

You can do that using this method

/// <summary>

/// This method highlights the assigned text with the specified color.

/// </summary>

/// <param name="textToMark">The text to be marked.</param>

/// <param name="color">The new Backgroundcolor.</param>

/// <param name="richTextBox">The RichTextBox.</param>

/// <param name="startIndex">The zero-based starting caracter position.</param>

public static void ChangeTextcolor(string textToMark, Color color, RichTextBox richTextBox, int startIndex)

{

    if (startIndex < 0 || startIndex > textToMark.Length-1) startIndex = 0;



    System.Drawing.Font newFont = new Font("Verdana", 10f, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, 178, false);

    try

    {               

        foreach (string line in richTextBox.Lines)

        { 

            if (line.Contains(textToMark))

            {

                richTextBox.Select(startIndex, line.Length);

                richTextBox.SelectionBackColor = color;

            }

            startIndex += line.Length +1;

        }

    }

    catch

    { }

}

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if (NotesList != null && NotesList.Count > 0)
{
_summaryNote = "";
foreach (NoteDO note in NotesList)
{
_summaryNote += note.Date.ToString() + " " + note.UserName + "\n" + note.Notes + "\n";
}
}
NotifyOfPropertyChange(() => SummaryNotes);



"note.Date.ToString() + " " + note.UserName" this part i need to make bold how can i make

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