如何在回发后重置asp.net表单？

<asp:Button ID="btnReset" runat="server" Text="重置" OnClientClick="document.getElementById('form1').reset(); return false;" />

protected void btnSubmit_Click(object sender, EventArgs e)
{
    // 处理表单数据
    // ...

    // 重置表单
    ResetForm();
}

private void ResetForm()
{
    foreach (Control control in this.Controls)
    {
        if (control is TextBox)
        {
            ((TextBox)control).Text = string.Empty;
        }
        else if (control is CheckBox)
        {
            ((CheckBox)control).Checked = false;
        }
        else if (control is RadioButton)
        {
            ((RadioButton)control).Checked = false;
        }
        else if (control is DropDownList)
        {
            ((DropDownList)control).SelectedIndex = 0;
        }
        else if (control is ListBox)
        {
            ((ListBox)control).SelectedIndex = -1;
        }
    }
}