Retrieve List Items form Shairpoint Online in c#

protected void GetListItem()
        {
            try
            {
                SecureString Password = new SecureString();
                Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");

                foreach (char c in "password")
                {
                    Password.AppendChar(c);
                }
                using (ClientContext context = new ClientContext(url))//https://orgname.sharepoint.com/sites/MainListSite"
                {
                    context.Credentials = new SharePointOnlineCredentials(username, Password);

                    List list = context.Web.Lists.GetByTitle("FirstMainList");//list name
                    context.Load(list);
                    context.ExecuteQuery();
                    Microsoft.SharePoint.Client.View view = list.Views.GetByTitle("All Items");//view name

                    context.Load(view);
                    context.ExecuteQuery();
                    CamlQuery query = new CamlQuery();
                    query.ViewXml = view.ViewQuery;

                    Microsoft.SharePoint.Client.ListItemCollection items = list.GetItems(query);
                    context.Load(items);
                    context.ExecuteQuery();
                    //Console.WriteLine("Total Count: " + items.Count);

                    foreach (Microsoft.SharePoint.Client.ListItem itm in items)
                    {
                        Label1.Text = itm["Title"].ToString() + itm["Mobile"].ToString();
                    }
                }
            }
            catch (Exception ex)
            {
                Label1.Text = "Exception " + ex.Message;
            }
        }