TypeOf運算和CTYPE代碼等同於C＃

Question

有人可以幫助我的等價代碼爲C＃

Public Sub ClearTextBox(ByVal root As Control) 
    For Each ctrl As Control In root.Controls 
     ClearTextBox(ctrl) 
     If TypeOf ctrl Is TextBox Then 
      CType(ctrl, TextBox).Text = String.Empty 
     End If 
    Next ctrl 
End Sub 

Answer 1

public void ClearTextBox(Control root) 
{ 
    foreach (Control ctrl in root.Controls) 
    { 
     ClearTextBox(ctrl); 
     if (ctrl is TextBox) 
     { 
      ctrl.Text = string.Empty; 
     } 
    } 
}