How do I add dropped down attribute to a dropdownlist in C#

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C#

ASP

hi,

I have this Drop-down list at client side.

<asp:DropDownList ID="DropDownList1" runat="server" 
        onselectedindexchanged="DropDownList1_SelectedIndexChanged">
    </asp:DropDownList>

and on the server side.

String mdbCon = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=D:\\InspectionR\\Database1.mdb";
            DataSet ds1 = new DataSet();
            string db = "SELECT MODEL_NAME FROM MODEL_LIST";
            using (OleDbConnection cn = new OleDbConnection(mdbCon))
            {
                using (OleDbDataAdapter da = new OleDbDataAdapter(db, cn))
                {
                    da.Fill(ds1, "Model");
                }
            }
            DropDownList1.DataTextField = "MODEL_NAME";
            DropDownList1.DataValueField = "MODEL_NAME";
            DropDownList1.DataSource = ds1;
            DropDownList1.DataBind();
           // DropDownList1.Attributes.Add("multiple", "multiple");

I want the feature like droppeddown = true property in VB.net

I tried "multiple" attribute, but it will only expand but won't drop down.


Thank you

What I have tried:

DropDownList1.Attributes.Add("multiple", "multiple");