DropDownButton conditional statement with attributes?

I'm having trouble to find out how to check if my DropDownList has the attribute Disabled

Here is my code (of how I declare my DropDownList):

<div class="col-7">
    <asp:DropDownList ID="cmbProperty" runat="server" class="browser-default z-depth-5">
    </asp:DropDownList>
</div>

On page load:

protected void Page_Load(object sender, EventArgs e)
{
    cmbProperty.Attributes.Add("disabled", "disabled");
}

On button click:

protected void btnCheckMyProperty_Click(object sender, EventArgs e)
{
    if(cmbProperty.Enabled == true)
    {
        // I always get a true statement
    }            
}

Someone has a clue about it?

Thank you