Input field clear

foreach (Control item in this.Controls)
{
    if (item is textBox)
    {
        (item as TextBox).Text = "";
    }
}

private void ClearTextBoxes(Control parent)
{
    if (parent is TextBox)
    {
        (item as TextBox).Text = "";
    }
    else
    {
        if (parent.Controls.Count > 0)
        {
            foreach (Control item in parent.Controls)
            {
                ClearTextBoxes(parent);
            }
        }
    }
}

foreach (Control item in this.Controls)
{
    ClearTextBoxes(item);
}