Highlight Text

[gmeii]

Does anyone know how to highlight a row of text in a richTextBox control.

[Heath Stewart]

If you look at the member documentation[^] for the RichTextBox class in the .NET Framework SDK, you'll find several properties that begin with Selection* or Selected*. Many of those properties give you several different ways of selecting text based on what you want to do. Keep in mind that there's not really a row, though. There are paragraphs that are wrapped and "rows" are formed by whatever words fit within the current width of the RichTextBox. The RichTextBox already does this, though, if you click the far left edge of the control. In applications like WordPad (which use the Rich-Edit control, which the RichTextBox class in .NET encapsulates), the margins are set wider so that it's easier to click and select a line. To do the same in your RichTextBox, set its ShowSelectionMargin property to true.

using System;
using System.Drawing;
using System.Windows.Forms;
 
class Test : Form
{
static void Main()
{
Application.Run(new Test());
}
 
Test()
{
RichTextBox rt = new RichTextBox();
Controls.Add(rt);
rt.Dock = DockStyle.Fill;
rt.ShowSelectionMargin = true;
 
Text = "Test";
}
}

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