WPF今天刚开始学！

编译没有问题！断点到地下那块就报：
Cannot create instance of 'Window1' defined in assembly 'FirstWPF, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'. 调用的目标发生了异常。  Error in up file 'Window1.xaml' Line 1 Position 9.
这个错
        void getData()
        {                       SqlConnectionStringBuilder connbuilder = new SqlConnectionStringBuilder();            connbuilder.DataSource = "(local)";            connbuilder.IntegratedSecurity = true;            connbuilder.InitialCatalog = "AdventureWorks";
            //start to make sql query            SqlConnection conn = new SqlConnection(connbuilder.ConnectionString);
           
            sda = new SqlDataAdapter("select * from Stu;", conn);            SqlCommandBuilder commbuilder = new SqlCommandBuilder(sda);            sda.UpdateCommand = commbuilder.GetUpdateCommand();就是这块报错            dt = new DataTable();            sda.AcceptChangesDuringUpdate = true;            sda.Fill(dt);
            listView1.ItemsSource = dt.DefaultView;        }