I have a problem in adding dropdownlist in input group..
I use this one..
<div class="input-group">
<div class="input-group-btn">
<asp:DropDownList runat="server" CssClass="selectpicker form-control">
<asp:ListItem Value="Val">Item1sadfasdf</asp:ListItem>
<asp:ListItem Value="Val3">Item2asdfasd</asp:ListItem>
</asp:DropDownList>
</div>
<asp:TextBox CssClass="form-control" ID="txtSearch" runat="server"></asp:TextBox>
<span class="input-group-btn">
<asp:Button CssClass="btn btn-info" runat="server" Text="Search" ID="btnSearch" OnClick="btnSearch_Click" />
</span>
</div>
but it just give me a result like this:

I also got a code like this..
<div class="input-group">
<div class="input-group-btn">
<button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown"><span runat="server" id="spanCategory">All Category</span>  <span class="caret"></span></button>
<ul id="myMenu" class="dropdown-menu">
<li><a href="#">All Category</a></li>
<li class="divider"></li>
<li><a href="#">JO Number</a></li>
<li><a href="#">Date</a></li>
<li><a href="#">Status</a></li>
<li><a href="#">Client Name</a></li>
<li><a href="#">Institution</a></li>
<li><a href="#">Department</a></li>
<li><a href="#">Location</a></li>
<li><a href="#">Priority</a></li>
<li><a href="#">Problem</a></li>
<li><a href="#">Remark</a></li>
<li><a href="#">Assigned</a></li>
<li><a href="#">CITI Department</a></li>
</ul>
</div>
<asp:TextBox CssClass="form-control" ID="txtSearch" runat="server"></asp:TextBox>
<span class="input-group-btn">
<asp:Button CssClass="btn btn-info" runat="server" Text="Search" ID="btnSearch" OnClick="btnSearch_Click" />
</span>
</div>
and showed me output like this..

It is what i want but the problem is that everytime i click the search button which do the post back, it just change the value into a default value which is the "All Category" value.. The value is just change through jQuery but everytime a postback is done the value back to default so i decided to use dropdownlist which retain its value even if there is a post back happen.. but the design is not that good..
How to make it same as the design i liked.. Thank you so much