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    <p>As it is clearly mentioned in <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.primitives.textboxbase.appendtext(v=vs.110).aspx" rel="nofollow noreferrer">Remarks section of MSDN Documentation</a></p> <blockquote> <p>The AppendText method enables the user to append text to the contents of a text control without using text concatenation, which, can yield better performance when many concatenations are required.</p> </blockquote> <p>Your question,</p> <blockquote> <p>what is the difference between these two methods?</p> </blockquote> <p>We all know how <code>TextBox.Text += something;</code> will work i.e. creating and appending a new string each time but how <code>AppendText</code> works I could not find any code snippet whether internally it uses <code>StringBuilder</code> or something else.</p> <blockquote> <p>Is one more efficient than the other?</p> </blockquote> <p>I think answer to above question will depend on the situation, <strong>(Based on Test case observation)</strong></p> <blockquote> <p>if <strong><code>Multiline</code></strong> property is set to <strong><code>false</code></strong> then <strong>Concatenation (+=)</strong> yields better results but on other hand <strong><code>Multiline</code></strong> property is set to <strong><code>True</code></strong> then <strong><code>AppendText</code></strong> yields far better performance.</p> </blockquote> <p><strong>EDIT</strong> After reading the <a href="https://stackoverflow.com/questions/20632372/textbox-text-string-vs-textbox-appendtextstring/20632719#comment30886034_20632719">comment from Rawling</a> I made a custom win-form solution in which I had a simple <code>textbox</code> in which I appended a simple string <code>hello</code> <strong>10000</strong> times using a simple <code>for-loop</code> </p> <pre><code> private void btnAppendText_Click(object sender, EventArgs e) { txtText.Text = string.Empty; DateTime startTime = DateTime.Now; for (int i = 0; i &lt; 10000; i++) { txtText.AppendText(s); } DateTime endTime = DateTime.Now; txtTime.Text = (endTime.Ticks - startTime.Ticks).ToString(); } private void btnConcante_Click(object sender, EventArgs e) { txtText.Text = string.Empty; DateTime startTime = DateTime.Now; for (int i = 0; i &lt; 5000; i++) { txtText.Text += s; } DateTime endTime = DateTime.Now; txtTime.Text = (endTime.Ticks - startTime.Ticks).ToString(); } </code></pre> <p><strong>Output</strong> were very surprising,<br> <strong>TEST 1: Multiline property is true</strong> I had to reduce the iteration to half i.e. 5000 for text concatenation as it was talking very long time</p> <blockquote> <p><code>btnAppendText_Click</code> output on <code>txtTime</code> was <strong><code>37222129</code></strong> almost 3-4 seconds for 10000 iteration<br> <code>btnConcante_Click</code> output on <code>txtTime</code> was <strong><code>14449906487</code></strong> more then 25 minutes for only 5000 iteration</p> </blockquote> <p>From the above result it is really clear that, <code>AppendText</code> is much faster and efficient (when <code>Multiline</code> is <code>True</code>) then <code>Concatenation</code></p> <p><strong>TEST 2: Multiline property is false</strong> </p> <blockquote> <p><code>btnConcante_Click</code> output on <code>txtTime</code> was <strong><code>39862280</code></strong> almost 3-4 seconds for 10000 iteration<br> <code>btnAppendText_Click</code> output on <code>txtTime</code> was <strong><code>1043279672</code></strong> almost 2-3 minutes for 10000 iteration</p> </blockquote> <p>From the above result it is really clear that, Concatenation is faster and efficient (when <code>Multiline</code> is <code>false</code>) then <code>AppendText</code></p>
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    1. POTextBox.Text += "string"; vs TextBox.AppendText("string");
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    1. POTextBox.Text += "string"; vs TextBox.AppendText("string");
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    1. COSurely this can be considered similar to the benefit you get from using StringBuilder compared to +=, when many concatenations are needed?
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    2. COThe MSDN documentation is actually rubbish. `AppendText` is not more efficient than concatenation. I ran a performance test and `.Text +=` is an orders of magnitude quicker than `.AppendText`.
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    3. CO@dbw - not true - we have reflector :) Microsoft code isn't protected from being looked upon (on purpose)
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      1. USOndrej Svejdar
 

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