获取页面上TextBox并改变它的值

请编程遍历页面上所有TextBox控件并给它赋值为string.Empty？

我做的时候分了2中情况：一种是窗体控件，另一种是web控件。

窗体控件：

View Code

foreach (System.Windows.Forms.Control aa in this.Controls)  
{  
if (aa is System.Windows.Forms.TextBox)  
    {  
        System.Windows.Forms.TextBox ss = (System.Windows.Forms.TextBox)aa;  
        ss.Text = String.Empty;  
    }  
} 

Web控件:

View Code

foreach (System.Web.UI.Control aa in this.FindControl("form1").Controls)  
{  
if (aa is System.Web.UI.WebControls.TextBox)  
    {  
        System.Web.UI.WebControls.TextBox ss = (System.Web.UI.WebControls.TextBox)aa;  
        ss.Text = String.Empty;  
    }  
}