select2+ASP.NET+MVC set values back to dropdown in edit mode - asp.net-mvc

Question

i am using select2 plugin with ASP.NET+MVC with multiple select option. i am able to save values into database of selected item. now I want to show those values (basically text which associate with those saved ids) into dropdown which has select2 plugin in edit mode.
how can i do that. below is my code.
$(document).ready(function () {
/* below values want to set to dropdown list
var selectedValue1 = '43,48,47,57';
$('#ddlCity1').select2({
multiple: true,
placeholder: "Select City",
allowClear: true,
tags: false, //prevent free text entry
width: "100%",
ajax: {
dataType: 'json',
delay: 250,
url: '#Url.Action("GetCityList", "DemoMVC")',
data: function (params) {
return {
searchTerm: params.term
};
},
processResults: function (data) {
var newData = [];
$.each(data, function (index, item) {
newData.push({
//id part present in data
id: item.Id,
//string to be displayed
text: item.City
});
});
return { results: newData };
},
cache: true
},
formatResult: function (element) {
return element.text + ' (' + element.id + ')';
},
formatSelection: function (element) {
return element.text + ' (' + element.id + ')';
},
escapeMarkup: function (m) {
return m;
},
});
$(".city1").on("select2:select", function (e) {
currentSelectedVal = $(e.currentTarget).val();
console.log(currentSelectedVal) // get selected values
});
$('.city1').on('select2:unselect', function (e) {
currentSelectedVal = $(e.currentTarget).val();
console.log(currentSelectedVal) // get selected values
});
});
//Dropdown with select2 control
<div class="row">
<div class="col-sm-12">
<div class="form-group">
<label>City</label>
<select id="ddlCity1" class="city1" style="width:500px"></select>
</div>
</div>
</div>