Page object for the html

using Microsoft.VisualStudio.TestTools.UITesting;
using Microsoft.VisualStudio.TestTools.UITesting.HtmlControls;

namespace CodedUITestProject1 {

    public class CalculatorPageHtml {

        private BrowserWindow _simpleCalculator { get; set; }
        private string _browserPath = @"http://www.calculator.org/jcalc98.aspx";
        private HtmlDocument _htmlDocument { get; set; }
        private HtmlControl _htmlControl { get;set;}
        private HtmlCustom _htmlCustom {get;set;}
        private HtmlAreaHyperlink _htmlAreaHyperlink { get; set; }
        private HtmlEdit _htmlEdit { get; set; }

        public CalculatorPageHtml() {

            _simpleCalculator = BrowserWindow.Launch(_browserPath);

            _simpleCalculator.SearchProperties[UITestControl.PropertyNames.Name] = "Virtual Calc98";
            _simpleCalculator.SearchProperties[UITestControl.PropertyNames.ClassName] = "IEFrame";

            _htmlDocument = new HtmlDocument(_simpleCalculator);
            _htmlDocument.FilterProperties[HtmlDocument.PropertyNames.AbsolutePath] = "/jcalc98.aspx";

            _htmlCustom = new HtmlCustom(_htmlDocument);
            _htmlCustom.SearchProperties["TagName"] = "MAP";
            _htmlCustom.SearchProperties[UITestControl.PropertyNames.Name] = "mainkeypad";
            _htmlCustom.FilterProperties["ControlDefinition"] = "name=\"mainkeypad\"";
            _htmlCustom.FilterProperties["TagInstance"] = "2";

            _htmlAreaHyperlink = new HtmlAreaHyperlink(_htmlCustom);
        }

        public void SetNumberBox(int numberForTextBox) {
            string digits = numberForTextBox.ToString();

            foreach (var digit in digits) {
                var mb = string.Format("mb({0})", digit);
                _htmlAreaHyperlink.FilterProperties[HtmlHyperlink.PropertyNames.AbsolutePath] = mb;
                _htmlAreaHyperlink.FilterProperties[HtmlHyperlink.PropertyNames.Href] = "javascript:" + mb;
                _htmlAreaHyperlink.FilterProperties[HtmlHyperlink.PropertyNames.TagInstance] = "7";
                Mouse.Click(_htmlAreaHyperlink);
            }
        }

        public void ClickAdd() {
            _htmlAreaHyperlink.FilterProperties[HtmlHyperlink.PropertyNames.AbsolutePath] = "Ib(\'+\')";
            _htmlAreaHyperlink.FilterProperties[HtmlHyperlink.PropertyNames.Href] = "javascript:Ib(\'+\')";
            _htmlAreaHyperlink.FilterProperties[HtmlHyperlink.PropertyNames.TagInstance] = "14";
            Mouse.Click(_htmlAreaHyperlink);
        }

        public void ClickEqual() {
            _htmlAreaHyperlink.FilterProperties[HtmlHyperlink.PropertyNames.AbsolutePath] = "Nb()";
            _htmlAreaHyperlink.FilterProperties[HtmlHyperlink.PropertyNames.Href] = "javascript:Nb()";
            _htmlAreaHyperlink.FilterProperties[HtmlHyperlink.PropertyNames.TagInstance] = "19";
            Mouse.Click(_htmlAreaHyperlink);
        }

        public string VerifyAnswer() {
            _htmlEdit = new HtmlEdit(_htmlDocument);
            _htmlEdit.SearchProperties[HtmlEdit.PropertyNames.Name] = "display";
            _htmlEdit.SearchProperties[HtmlEdit.PropertyNames.Type] = "SINGLELINE";
           _htmlEdit.FilterProperties[HtmlEdit.PropertyNames.TagInstance] = "1";
            return _htmlEdit.Text;
        }
    }
}