for (int i = 0; i < this.Controls.Count; i++) 
{ 
foreach (System.Web.UI.Control control in this.Controls[i].Controls) 
{ 
if (control is TextBox) 
(control as TextBox).Text = ""; 
} 
} 
foreach (Control cl in this.Page.FindControl("Form1").Controls) 
{ 
if (cl.GetType().ToString() == "System.Web.UI.WebControls.TextBox") 
{ 
((TextBox)cl).Text = ""; 
} 
} 
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