Asp.net Radio Button

protected void btnClear_Click(object sender, EventArgs e)
{
    //This one call clear method to clear all control values
    clear();
}

void clear()
{
    foreach (Control c in form1.Controls)
    {
        
        //Clear all radio buttons
        if (c is RadioButton)
            ((RadioButton)c).Checked = false;       
    }
}