I am unable to display dropdownlist in MVC4

Dear All,

In my Project (ATM Tiller machine) I am trying to display a drop down list, but its displaying in grid format, because in my current project all dropdown displaying in grid/table format only, because these ddl are having very less records.

But I want i display dropdownlist with 100 records, so Table/Grid format is not possible, could you please help me how to display dropdown using MVC4.since ATM screen size is small hence they are displying in Grid format.

XX.cshtml code:-

var listBankNames = GetDropdownData(Model.AvailableBankList);

@Html.DropDownListFor(model => model.Bankname.Value, listBankNames, "", null)

At present result is showing as Grid format, But I need dropdownlist.