Error in viewing a web page in browser through the created VS AddIn

I want to View a selected web page in browser through coding of the VS Add-In that I have created. So My code goes as below.

DTE dte;

EnvDTE.UIHierarchy solutionExplorerHier = default(EnvDTE.UIHierarchy);

string currentProject = dte.ActiveDocument.ProjectItem.ContainingProject.UniqueName;
                
string projName = currentProject.Substring(currentProject.LastIndexOf("\\") + 1);

string name = "AfterFixingData\\createdPage_After.aspx";
                string path = System.IO.Path.Combine(projName, name);
                dte.Windows.Item(Constants.vsWindowKindSolutionExplorer).Activate();

string solutionName = Path.GetFileNameWithoutExtension(dte.Solution.FullName);
                 dte.ActiveWindow.Object.GetItem(path).Select(vsUISelectionType.vsUISelectionTypeSelect);

dte.ExecuteCommand("File.ViewinBrowser");

but when I try run this code I got this error.

'object' does not contain a definition for 'GetItem' and no extension method 'GetItem' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)

Is this the way to do a view in browser? If so please help me to fix this problem. Do I need to add any other References? 

If my code is incorrect, please be kind enough to correct me. It's sort of urgent