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;

}

}

}

}

}

}