unauthorized when i want to load data from a list of a site

Question

hello

 i want to load data from a sharepoint site. I also give my username and password but it is said it is unauthorized, below is my code, can you help me pelase?thank you

 

  tring siteUrl = "the name of my sharepointsite"; ClientContext clientContext = new ClientContext(siteUrl); clientContext.AuthenticationMode = ClientAuthenticationMode.FormsAuthentication; clientContext.FormsAuthenticationLoginInfo = new FormsAuthenticationLoginInfo("myusername", "mypassword"); List oList = clientContext.Web.Lists.GetByTitle(item.Header); CamlQuery query = CamlQuery.CreateAllItemsQuery(100); //CamlQuery camlQuery = new CamlQuery(); // camlQuery.ViewXml = "<View><RowLimit>100</RowLimit></View>"; ListItemCollection collListItem = oList.GetItems(query); clientContext.Load(collListItem); clientContext.ExecuteQuery(); foreach (ListItem oListItem in collListItem) { mylist.mydynamicgrid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Auto), Tag = item }); }