How do I set a textbox s text to bold at run time

Question

I m using Windows forms and I have a textbox which I would occassionally like to make the text bold if it is a certain value   How do I change the font characteristics at run time   I see that there is a property called textbox1 Font Bold but this is a Get only property

User · Answer

txtText Font   new Font  Segoe UI   8 FontStyle Bold      Font Font Name Font Size Font Style

User · Answer

Here is an example for toggling bold  underline  and italics     protected override bool ProcessCmdKey  ref Message msg  Keys keyData              if   ActiveControl is RichTextBox r                    if   keyData      Keys Control   Keys B                            r SelectionFont   new Font  r SelectionFont  r SelectionFont Style   FontStyle Bold       XOR will toggle             return true                      if   keyData      Keys Control   Keys U                            r SelectionFont   new Font  r SelectionFont  r SelectionFont Style   FontStyle Underline       XOR will toggle             return true                      if   keyData      Keys Control   Keys I                            r SelectionFont   new Font  r SelectionFont  r SelectionFont Style   FontStyle Italic       XOR will toggle             return true                           return base ProcessCmdKey  ref msg  keyData

User · Answer

Depending on your application  you ll probably want to use that Font assignment either on text change or focus unfocus of the textbox in question   Here s a quick sample of what it could look like  empty form  with just a textbox  Font turns bold when the text reads  bold   case-insensitive    public partial class Form1   Form       public Form1                 InitializeComponent            RegisterEvents               private void RegisterEvents                  tboTest TextChanged    new EventHandler TboTest TextChanged              private void TboTest TextChanged object sender  EventArgs e                   Change the text to bold on specified condition         if   tboTest Text Equals  Bold   StringComparison OrdinalIgnoreCase                          tboTest Font   new Font  tboTest Font  FontStyle Bold                     else                        tboTest Font   new Font  tboTest Font  FontStyle Regular

User · Answer

You could use Extension method to switch between Regular Style and Bold Style as below   static class Helper               public static void SwtichToBoldRegular this TextBox c                        if  c Font Style   FontStyle Bold                  c Font   new Font c Font  FontStyle Bold               else                 c Font   new Font c Font  FontStyle Regular                     And usage   textBox1 SwtichToBoldRegular

User · Answer

The bold property of the font itself is read only  but the actual font property of the text box is not  You can change the font of the textbox to bold as follows     textBox1 Font   new Font textBox1 Font  FontStyle Bold     And then back again     textBox1 Font   new Font textBox1 Font  FontStyle Regular

[c#] How do I set a textbox's text to bold at run time?

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