Making specific text bold in a string in C# Windows Forms

Question

I want to make part of the text bold in a textbox, for example the textbox contains.

"This is a text box"

So it will be "This is a text box"

How can I do it in C# Windows Forms?

Solution

You can do this with the help of FontStyle interface. Just add a button in your form and name it Bold and create a click event for that. You have to use RichTextBox for this, you cannot do this with TextBox. This code will convert the selected text to bold.

private void btnBold_Click(object sender, EventArgs e)
    {
        FontStyle style = tbMessage.SelectionFont.Style;
        if (tbMessage.SelectionFont.Bold)
        {
            style = style & ~FontStyle.Bold;
            btnBold.Font = new Font(btnBold.Font, FontStyle.Regular);
        }
        else
        {
            style = style | FontStyle.Bold;
            btnBold.Font = new Font(btnBold.Font, FontStyle.Bold);
        }
        tbMessage.SelectionFont = new Font(tbMessage.SelectionFont, style);
        tbMessage.Focus();

    }

Comments

[Robert Langdon]

So is it that only second word should be bold?

[TheBetaProgrammer]

Try using html This '<b>is</b>' a text book

[Michael Naidis]

It's windows forms by the way, and not necessarily second, Robert - word of my choice.

[user3613916]

Is this a RichTextBox or just a normal TextBox?

[Michael Naidis]

What if I want just a word from the message?

[pooja_baraskar]

select that word with the help of mouse and click on the bold button which has the event handler with code above. This will make the selected word Bold/Unbold. Just try this code once , you will understand.