遍历页面上所有TextBox，并赋值为String.Empty

//不含母板页

foreach (System.Web.UI.Control txtobj in this.Page.Controls)

 

{

    if (txtobj.GetType().Name .Equals("TextBox"))

    {

       // ((TextBox)txtobj).Text = String.Empty;//这是第一种方法赋值，第二种在下面

        TextBox tb = new TextBox();

         tb = (TextBox)this.FindControl(txtobj.ID);

 

         tb.Text = String.Empty;

    }

}

包含母板页

//套用母版页的页面遍历TextBox控件的方法，其他控件类似

 

foreach (Control cp in Page.Controls)   

{   

       foreach (System.Web.UI.Control ct in cp.Controls)   

       {  

            if (ct is HtmlForm)   

            {   

                  foreach (Control con in ct.Controls)  

                  {   

                      foreach (Control c in con.Controls)  

                      {  

                          if (c is TextBox)  

                          {  

                              (c as TextBox).Text = String.Empty;  

                          }  

                      }   

                  }   

             }   

       }   

}