asp.net遍历页面中所有TextBox，并赋值为String.Empty的方法

foreach(Control c in this.controls)
{
  if(c is TextBox)
    {
           TextBox tb=(TextBox)c；
        tb.Text=String.empty； 
    }
}
//或
foreach (Control col in this.Controls) 
{ 
     if (col.GetType().Name.Equals("TextBox")) 
     { 
         ((TextBox)col).Text = 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; 
                          } 
                      }  
                  }  
             }  
       }  
}

// 清空指定页面上所有的控件内容
//public static void ClearAllContent()
//清空指定页面上所有的控件内容
//包括TextBox，CheckBox,CheckBoxList,RadioButton,RadioButtonList。不过不清
//除如ListBox，DropDownList，因为这样的控件值对当前页面来说还能用，一般这些控件里都是保存的字典数据。
//<param name="page"> 指定的页面</param>
public static void ClearAllContent(System.Web.UI.Control page)
{
int nPageControls = page.Controls.Count;
for (int i = 0; i < nPageControls; i++)
{
foreach (System.Web.UI.Control control in page.Controls[i].Controls)
{
if (control.HasControls())
{
ClearAllText(control);
}
else
{
if (control is TextBox)
(control as TextBox).Text = "";
 
if (control is CheckBox)
(control as CheckBox).Checked = false;
 
if (control is RadioButtonList)
(control as RadioButtonList).SelectedIndex = -1;
 
if (control is RadioButton)
(control as RadioButton).Checked = false;
 
if (control is CheckBoxList)
{
foreach (ListItem item in (control as CheckBoxList).Items)
{
item.Selected = false;
}
}
}//if..else
}//foreach
}//for
}

#region 清空指定页面上所有的控件内容，public static void ClearAllContent()
/// <summary>
/// 清空指定页面上所有的控件内容，包括TextBox，CheckBox,CheckBoxList,RadioButton,RadioButtonList。但是不清
/// 除如ListBox，DropDownList，因为这样的控件值对当前页面来说还可以用，一般这些控件里都是保存的字典数据。
/// Author：Kevin
/// www.jbxue.com
/// </summary>
/// <param name="page"> 指定的页面</param>
public static void ClearAllContent(System.Web.UI.Control page)
{
int nPageControls = page.Controls.Count;
for (int i = 0; i < nPageControls; i++)
{
foreach (System.Web.UI.Control control in page.Controls[i].Controls)
{
if (control.HasControls())
{
ClearAllText(control);
}
else
{
if (control is TextBox)
(control as TextBox).Text = "";

if (control is CheckBox)
(control as CheckBox).Checked = false;

if (control is RadioButtonList)
(control as RadioButtonList).SelectedIndex = -1;

if (control is RadioButton)
(control as RadioButton).Checked = false;

if (control is CheckBoxList)
{
foreach (ListItem item in (control as CheckBoxList).Items)
{
item.Selected = false;
}
}
}//if..else
}//foreach
}//for
}
#endregion