You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You create a page that contains the following code fragment：       You write the following code segment in the code-behind file for the page：   void BindData（object sender， EventArgs e） {   lstLanguages.DataSource =  CultureInfo.GetCultures（CultureTypes.AllCultures）；   lstLanguages.DataTextField = "EnglishName"；  lstLanguages.DataBind（）；   }   You need to ensure that the lstLanguages ListBox control maintains the selection of the user during postback.  Which line of code should you insert in the constructor of the page？（）

• A、this.Init += new EventHandler(BindData); 
• B、this.PreRender += new EventHandler(BindData); 
• C、lstLanguages.PreRender += new EventHandler(BindData); 
• D、lstLanguages.SelectedIndexChanged += new EventHandler(BindData);