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    <p>Because <code>System.Windows.Controls.RichTextBox</code> does not have a property for <code>Text</code> to detect its value, you may detect its value using the following</p> <pre><code>string _Text = new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text; </code></pre> <p>Then, you may change <code>_Text</code> and post the new string using the following</p> <pre><code>_Text = _Text.Replace("pc", "Personal Computer"); if (_Text != new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text) { new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text = _Text; } </code></pre> <p>So, it'd look like this</p> <pre><code>string _Text = new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text; _Text = _Text.Replace("pc", "Personal Computer"); // Replace pc with Personal Computer if (_Text != new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text) { new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text = _Text; // Change the current text to _Text } </code></pre> <p><strong>Remark</strong>: Instead of using <code>Text.Replace("pc", "Personal Computer");</code> you may declare a <code>List&lt;String&gt;</code> in which you save the characters and its replacements</p> <p><strong>Example:</strong></p> <pre><code> List&lt;string&gt; _List = new List&lt;string&gt;(); private void richTextBox1_TextChanged(object sender, TextChangedEventArgs e) { string _Text = new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text; for (int count = 0; count &lt; _List.Count; count++) { string[] _Split = _List[count].Split(','); //Separate each string in _List[count] based on its index _Text = _Text.Replace(_Split[0], _Split[1]); //Replace the first index with the second index } if (_Text != new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text) { new TextRange(richTextBox1.Document.ContentStart, richTextBox1.Document.ContentEnd).Text = _Text; } } private void Window_Loaded(object sender, RoutedEventArgs e) { // The comma will be used to separate multiple items _List.Add("pc,Personal Computer"); _List.Add("sc,Star Craft"); } </code></pre> <p>Thanks, <br> I hope you find this helpful :)</p>
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    1. USPicrofo Software
    1. USPicrofo Software
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    1. COWorked a treat, thanks for your help :)
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    2. CO@Mike No problems at all, Glad I could help :)
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