Bootstrap set default selected

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ASP.NET

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Hi guys I use bootstrap multiple dropdown my projects
so I have datasource. and some opinon should selected when page came how can I do?


this is my output of html

<div class="multiselectdrop">


                    <select name="ctl00$cPlaceHolder$ddlGearType" id="cPlaceHolder_ddlGearType" class="selectpicker" title="xxx" multiple="" style="display: none;">
	<option value="Düz Vites">xxx</option>
	<option value="Otomatik">zzzzz</option>

</select><div class="btn-group bootstrap-select show-tick open"><button type="button" class="btn dropdown-toggle selectpicker btn-default" data-toggle="dropdown" data-id="cPlaceHolder_ddlGearType" title="xxx"><span class="filter-option pull-left">xxx</span> <span class="caret"></span></button><div class="dropdown-menu open" style="max-height: 186px; overflow: hidden; min-height: 0px;"><ul class="dropdown-menu inner selectpicker" role="menu" style="max-height: 174px; overflow-y: auto; min-height: 0px;"><li rel="0" class=""><a tabindex="0" class="" style=""><span class="text">xxxx</span></a></li><li rel="1" class=""><a tabindex="0" class="" style=""><span class="text">xxxx</span>^__i class="glyphicon glyphicon-ok icon-ok check-mark"></a></li></ul></div></div>

                </div>