学步园

public void Clean(Form form)
        {
            for (int i = 0; i < form.Controls.Count; i++)
            {
                //清空TextBox值
                if (Controls[i].GetType() == typeof(TextBox))
                {
                    ((TextBox)Controls[i]).Text = "";
                }
                //清空label值
                if (Controls[i].GetType() == typeof(Label))
                {
                    ((Label)Controls[i]).Text = "";
                }

               //其余控件以此类推
                //清空所有控件的值
                Controls[i].Text = "";
            }
        }

//调用方法.

Clean(this.FindForm());

------------------------------------------------------------------

//将所用字段放在一个groupBox中，

foreach(Control c in this.groupBox)

{

      if(c is TextBox || c is lable || c is CombBox)

       {

                  c.Text="";

        }

}