C#中，获取容器中所有控件

foreach (Control contr in this.palchangepassword.Controls)
            {
                contr.Visible = true;
            }

C#中，获取容器中某种控件

 foreach (Control con in this.Controls)
           {
               if (con.GetType() == typeof(Label))
               {
                   con.Visible = false;
               }
           }

C#中基础知识积累