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copied!<p>Thank you everyone. After thinking and programming for a almost whole day, I came to decision that i have to use native htmlElement instead of htmlagilitypack HtmlNode, because I want to input text into Htmlelement in webbrowser . so here is the code that i came up with. still i would appreciate if someone shows a solution with htmlagilitypack.</p> <pre><code> public HtmlElement selectHtmlNode(string xPath, HtmlElement htmlElement) { string currentNode; int indexOfElement; //get string representation of current Tag. if (xPath.Substring(1,xPath.Length-2).Contains('/')) currentNode = xPath.Substring(1, xPath.IndexOf('/', 1) - 1); else currentNode = xPath.Substring(1, xPath.Length-1); //gets the depth of current xPath int numOfOccurence = Regex.Matches(xPath, "/").Count; //gets the children's index int.TryParse(Regex.Match(currentNode, @"\d+").Value, out indexOfElement); //if i have to select nth-child ex: /tr[4] if (indexOfElement > 1) { currentNode = currentNode.Substring(0, xPath.IndexOf('[') - 1); //the tag that i want to get if (numOfOccurence == 1 || numOfOccurence == 0) { return htmlElement.Children[indexOfElement - 1]; } //still has some children tags if (numOfOccurence > 1) { int i = 1; //select nth-child foreach (HtmlElement tempElement in htmlElement.Children) { if (tempElement.TagName.ToLower() == currentNode && i == indexOfElement) { return selectHtmlNode(xPath.Substring(xPath.IndexOf('/', 1)), tempElement); } else if (tempElement.TagName.ToLower() == currentNode && i < indexOfElement) { i++; } } } } else { if (numOfOccurence == 1 || numOfOccurence == 0) { return htmlElement.FirstChild; } if (numOfOccurence > 1) { foreach (HtmlElement tempElement in htmlElement.Children) { if (tempElement.TagName.ToLower() == currentNode) { return selectHtmlNode(xPath.Substring(xPath.IndexOf('/', 1)), tempElement); } } } } return null; } </code></pre> <p>function is called in this way. where htmlController is instance of some class.</p> <pre><code>HtmlElement currentElement = htmlController.selectHtmlNode("/body/form/div/div[2]/div/div/input", webBrowser.Document.GetElementsByTagName("html")[0]); currentElement.SetAttribute("Value", "hello world"); </code></pre>

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