Display two fields side by side in a Bootstrap Form

The problem is that .form-control class renders like a DIV element which according to the normal-flow-of-the-page renders on a new line.

One way of fixing issues like this is to use display:inline property. So, create a custom CSS class with display:inline and attach it to your component with a .form-control class. You have to have a width for your component as well.

There are other ways of handling this issue (like arranging your form-control components inside any of the .col classes), but the easiest way is to just make your .form-control an inline element (the way a span would render)

@KyleMit's answer on Bootstrap 4 has changed a little

<div class="input-group">
    <input type="text" class="form-control">
    <div class="input-group-prepend">
        <span class="input-group-text">-</span>
    </div>
    <input type="text" class="form-control">
</div>

How about using an input group to style it on the same line?

Here's the final HTML to use:

<div class="input-group">
    <input type="text" class="form-control" placeholder="Start"/>
    <span class="input-group-addon">-</span>
    <input type="text" class="form-control" placeholder="End"/>
</div>

Which will look like this:

Here's a Stack Snippet Demo:

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.css" rel="stylesheet"/>

<div class="input-group">
    <input type="text" class="form-control" placeholder="Start"/>
    <span class="input-group-addon">-</span>
    <input type="text" class="form-control" placeholder="End"/>
</div>

I'll leave it as an exercise to the reader to translate it into an asp:textbox element