Csharp windowform controls clear

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/// <summary>         /// 遍曆清除指定的控件         /// 塗聚文 2011-10-18         /// 締友計算機信息技術有限公司         /// </summary>         /// <param name="con"></param>         public void ClearControl(Control.ControlCollection con)         {             foreach (Control C in con)             {                 if (C.GetType().Name == "TextBox")                     if (((TextBox)C).Visible == true)                         ((TextBox)C).Clear();                 if (C.GetType().Name == "MaskedTextBox")                     if (((MaskedTextBox)C).Visible == true)                         ((MaskedTextBox)C).Clear();                 if (C.GetType().Name == "ComboBox")                     if (((ComboBox)C).Visible == true)                         ((ComboBox)C).Text = "";                 if (C.GetType().Name == "PictureBox")                     if (((PictureBox)C).Visible == true)                         ((PictureBox)C).Image = null;             }         }               //在winForm調用方法             Control.ControlCollection coll = this.Controls;             formOperatin.ClearControl(coll);