clear All Textboxes code

clear all textboxes in form

protected void Button1_Click(object sender, EventArgs e)
{

foreach (Control ctrl in Form.Controls)
{
if (ctrl.GetType().ToString() == "System.Web.UI.WebControls.TextBox")
{
((TextBox)ctrl).Text = string.Empty;
}
}
masterpage
ContentPlaceHolder content1 = (ContentPlaceHolder)Master.FindControl("ContentPlaceHolder1");
foreach (Control ctrl in content1.Controls)
{

if (ctrl.GetType().ToString() == "System.Web.UI.WebControls.Panel")
{
foreach (Control ctr in Panel1.Controls)
{
if (ctr.GetType().ToString() == "System.Web.UI.WebControls.TextBox")
((TextBox)ctr).Text = string.Empty;
}
}
}

foreach (Control c in this.Controls)
{
if (c.GetType().ToString () == "TextBox")
((TextBox)c).Text = string.Empty;
}
}