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    <p>Calling <code>text1.Text.ToLower()</code> will not make the text in your rich text box to be in lower case, because it just returning value.</p> <p>You can keep it in a string:</p> <p><code>string text = text1.Text.ToLower();</code></p> <p>Then using the string text to process the searching.</p> <p>Moreover, I don't quite sure about the <code>Find</code> method, but it should has a ignore case option. If not, make sure to convert the compared text to lowercase too.</p> <p>EDIT:</p> <p>I may be mistaken about which one is the richTextBox, <code>text1</code> or <code>Basic_Word_Processor.Instance.richTextBoxPrintCtrl1</code></p> <p>If the case is the one in Basic_Word_processor, then in the MSDN link you give in the comment:</p> <pre><code> string temp = Basic_Word_Processor.Instance.richTextBoxPrintCtrl1.Text.ToLower(); Basic_Word_Processor.Instance.richTextBoxPrintCtrl1.Text = ""; Basic_Word_Processor.Instance.richTextBoxPrintCtrl1.Text = temp; </code></pre> <p>It basically said: </p> <ul> <li>Convert the text in the RichTextBox to lowercase. Keep it in temp</li> <li>Set the RichTextBox text ot empty</li> <li>Replace the RichTextBox text with the temp</li> </ul> <p>Of course it makes your RichTextBox lowercase.</p> <p>EDIT2:</p> <p>Ok seems like the user want to highlight all the found text by given keyword and it is not working. I'll try to answer it.</p> <p>First, Rather than using the Find() method in the rich text box, use the <code>SelectionStart</code> and <code>SelectionLength</code> instead. I don't see the Find() method to give case insensitive comparison. </p> <p>Example:</p> <pre><code>string richText = Basic_Word_Processor.Instance.richTextBoxPrintCtrl1.Text.ToLower(); string keyText = textBox1.Text.ToLower(); </code></pre> <p>In the while syntax, use the overload string LastIndexOf to compare non-case sensitive. This may not be a matter now as the rich is already in lower state.</p> <pre><code>while (index &lt; richText.LastIndexOf(textBox1.Text, StringComparison.InvariantCultureIgnoreCase)) </code></pre> <p>Then to find the text, use the following:</p> <pre><code>index = richText.IndexOf(keyText, index); </code></pre> <p>Then set the color like this:</p> <pre><code>Basic_Word_Processor.Instance.richTextBoxPrintCtrl1.SelectionStart = index; Basic_Word_Processor.Instance.richTextBoxPrintCtrl1.SelectionLength = keyText.Length; Basic_Word_Processor.Instance.richTextBoxPrintCtrl1.SelectionBackColor = Color.Yellow; </code></pre>
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    1. POHow do I make my richTextBox search case-insensitive?
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    1. COthis is the link to the MSDN question. I tried following it and it made the text in the richTextBox go to lower case. http://social.msdn.microsoft.com/Forums/en-US/visualstudiogeneral/thread/7f51c769-ff81-4154-8291-0fd0bf3fff87
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    2. COI have updated my answer, however, have you tried your solution yet?
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    3. COI did. It did not seem to work.
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