Pastable version of Strip Html Comments

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 <pre class="sunburst">public static class HtmlHelper {
 public static string StripHtmlComments(string html) {
 if (html == null) {
 throw new ArgumentNullException(&quot;html&quot;);
 }

if (html.IndexOf(&quot;&lt;!&quot;, StringComparison.Ordinal) &lt; 0) {
 return html;
 }

var cleanedHtml = new char[html.Length];
 bool inHtmlComment = false;
 bool inHtmlTag = false;
 int cleanCount = 0;

for (int i = 0; i &lt; html.Length; i++) {
 char current = html[i];

if (!inHtmlComment &amp;&amp; !inHtmlTag) {
 if (current == '&lt;') {
 if (i + 1 &lt; html.Length) {
 char nextChar = html[i + 1];
 if (nextChar == '!') {
 inHtmlComment = true;
 continue;
 }
 else {
 if (IsEnglishLetter(nextChar)) {
 inHtmlTag = true;
 }
 }
 }
 }
 }
 else if(inHtmlComment) {
 if (current == '&gt;') {
 if (inHtmlComment) {
 inHtmlComment = false;
 continue;
 }
 }
 continue;
 }
 else if (inHtmlTag) {
 if (current == '&gt;') {
 inHtmlTag = false;
 }
 }

cleanedHtml[cleanCount++] = current;
            }

return new String(cleanedHtml, 0, cleanCount);
 }

private static bool IsEnglishLetter(char nextChar) {
 return ('a' &lt;= nextChar &amp;&amp; nextChar &lt;= 'z') || ('A' &lt;= nextChar &amp;&amp; nextChar &lt;= 'Z');
 }

}

//Unit Tests
[TestMethod]
public void NullStringReturnsThrowsArgumentNullException() {
 try {
 HtmlHelper.StripHtmlComments(null);
 Assert.Fail();
 }
 catch (ArgumentNullException) { 
 }
}

[TestMethod]
public void EmptyStringReturnsEmpty() {
 Assert.AreEqual(string.Empty, HtmlHelper.StripHtmlComments(string.Empty));
}

[TestMethod]
public void StringWithoutCommentReturnsSameString() {
 string s = &quot;This has &lt;strong&gt;No Comments&lt;/strong&gt;!&quot;;
 Assert.AreEqual(s, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void StringWithOnlyCommentReturnsEmptyString() {
 string s = &quot;&lt;!-- this go bye bye&gt;&quot;;
 Assert.AreEqual(string.Empty, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void Html_WithNonDashDashComment_ReturnsEmptyString() {
 string s = &quot;&lt;! this go bye bye&gt;&quot;;
 Assert.AreEqual(string.Empty, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void StringWithTwoConsecutiveCommentsReturnsEmptyString() {
 string s = &quot;&lt;!-- this go bye bye&gt;&lt;!-- another comment&gt;&quot;;
 Assert.AreEqual(string.Empty, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void CommentWithStringBeforeReturnsString() {
 string s = &quot;Hello&lt;!-- this go bye bye --&gt;&quot;;
 Assert.AreEqual(&quot;Hello&quot;, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void CommentWithStringAfterReturnsString() {
 string s = &quot;&lt;!-- this go bye bye --&gt;World&quot;;
 Assert.AreEqual(&quot;World&quot;, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void Html_WithAngleBracketsButNotHtml_NotSripped() {
 string s = &quot;&lt;$)*(@&amp;$(@*&gt;&quot;;
 Assert.AreEqual(s, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void Html_WithCommentInterleavedWithText_RendersText() {
 string s = &quot;Hello &lt;!-- this go bye bye --&gt; World &lt;!--&gt; This is fun&quot;;
 Assert.AreEqual(&quot;Hello World This is fun&quot;, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void Html_WithHtmlTags_DoesNotStripHtml() {
 string s = &quot;&lt;strong&gt;Hello&lt;/strong&gt;&lt;!this go bye bye&gt;&quot;;
 Assert.AreEqual(&quot;&lt;strong&gt;Hello&lt;/strong&gt;&quot;, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void Html_WithCommentInAttribute_DoesNotStripAttributeValue() {
 string s = &quot;&lt;img alt=\&quot;&lt;!-- This should remain --&gt;\&quot; /&gt;&quot;;
 Assert.AreEqual(s, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void Html_WithCommentInSingleQuotedAttribute_DoesNotStripAttributeValue() {
 string s = &quot;&lt;img alt=\'&lt;!-- This should remain --&gt;\' /&gt;&quot;;
 Assert.AreEqual(s, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void Html_WithCommentInNonQuotedAttribute_DoesNotStripAttributeValue() {
 string s = &quot;&lt;p title=&lt;!--Thisshouldremain--&gt;Test&lt;/p&gt;&quot;;
 Assert.AreEqual(s, HtmlHelper.StripHtmlComments(s));
}

[TestMethod]
public void Html_WithCommentBetweenNonTagButLooksLikeTag_DoesStripComment() {
 string s = @&quot;&lt;ç123 title=&quot;&quot;&lt;!bc def&gt;&quot;&quot;&gt;&quot;;
 Assert.AreEqual(@&quot;&lt;ç123 title=&quot;&quot;&quot;&quot;&gt;&quot;, HtmlHelper.StripHtmlComments(s));
}

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Refactor :my => 'code'

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Pastable version of Strip Html Comments