Place Checkbox to Right side of TextBox in Bootstrap

https://ibb.co/g5rycH

i wanted checkbox to be in the right side of designation textbox.how to do it? Any help will be highly appreciated.

                                        <div class="row-fluid">   
                                            <div class="col-md-12">
                                                <h3 style="color:#fc2630;font-size:14px;padding-bottom:15px;">Please Fill Information & Select Checkbox at right In order to Add Stand Manager details:</h3>
                                                 <div class="form-group col-md-6">
                                                     <asp:Label ID="lblheading_1_" runat="server"  Text="Stand Manager 1" ></asp:Label>
                                                     <asp:TextBox ID="txtStandManager1_" CssClass="form-control" style="height:90%;width:90%;" runat="server"></asp:TextBox>
                                                 </div>
                                                  <div class="form-group col-md-6">
                                                      <asp:Label ID="Label34" runat="server" Text="Designation" ></asp:Label>
                                                      <asp:TextBox ID="txtDesignation1_"  CssClass="form-control" style="height:90%;width:90%;" runat="server"></asp:TextBox>
                                                       <%--<asp:CheckBox ID="chk1_" runat="server" Checked="True" Enabled="False" />--%>
                                                      <asp:CheckBox ID="chk1_" runat="server" CssClass="checkbox" Style="Display:inline-block" Checked="True" Enabled="False" />
                                                  </div>
                                              </div>
                                          </div>