1. textbox

                    <input type="text" class="form-control" id="user_name" name="user_name" value="">
                 

An input should have type , name and value

2. with label

                      <div class="form-group">
                          <label for="usr">Name:</label>
                          <input type="text" class="form-control" id="user_name" name="user_name" value="">
                      </div>