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private void InitialControl(ControlCollection objControlCollection)
    {
        foreach (Control objControl in objControlCollection)
        {
            if (objControl.HasControls())
            {
                InitialControl(objControl.Controls);
            }
            else
            {
                  TextBox textBox = objControl as TextBox;
                    if (textBox != null)
                    {
                        textBox.Text = "xx";
                    }

            }
        }
    }