SqlDataAdapter da3 = new SqlDataAdapter(com2);
DataSet ds2 = new DataSet();
da3.Fill(ds2); // fill dataset
ddlYear.DataTextField = ds2.Tables[0].Columns["yearofcd"].ToString(); // text field name of table dispalyed in dropdown
ddlYear.DataSource = ds2.Tables[0]; //assigning datasource to the dropdownlist
ddlYear.DataBind(); //binding dropdownlist
ddlYear.SelectedIndex = 1;
<asp:DropDownList ID="ddlYear" runat="server"></asp:DropDownList>
<div>
<select id="checkboxes" multiple="multiple">
<option></option>
</select>
</div>
here I'm Binding data in ddlYear how to use it in the option of select tag?