How to remove the
tag in my html string using HtmlAgilityPack in C#?

It is as simple as:

• the HTML snippet being loaded into an Agility PackHtmlDocument
• obtaining all<br /> using the tags"//br" expression for xpath
• Using the tags collected in the prior step, deletingRemove() method
• evaluating the outcome in theDocumentNode.OuterHtml property

The code is as follows:

const string htmlFragment =
    @"<p class=""Normal-P"" style=""direction: ltr; unicode-bidi: normal;"">" +
    @"<span class=""Normal-H"">sample<br/></span>" +
    @"<span class=""Normal-H"">texting<br></span></p> ";

var document = new HtmlAgilityPack.HtmlDocument();
document.LoadHtml(htmlFragment);

foreach (var brTag in document.DocumentNode.SelectNodes("//br"))
    brTag.Remove();

Console.WriteLine(document.DocumentNode.OuterHtml);