Unwanted calling onClick event on button after pressed enter

net web page I have textBox and button.

I added onClick for button.

Problem is that if I click enter in textBox it also call onClick event for button. I understand why.

My code is here:

TextBox is in view:

                      <asp:View ID="BlView" runat="server">
                           <p class="tabHead"> BLACK LIGHT LABEL DATA </p>
                            <table class="tab">
                                <tr>
                                    <td>
                                        <asp:Label ID="Label1" runat="server" class="label" Text="BARCODE" />
                                    </td>
                                    <td>
                                        <asp:TextBox ID="bl_tb_barcode" runat="server" BorderWidth="1px" 
                                            class="textBox"  Width="700"/>
                                    </td>
                                </tr>
                            </table>
                     </asp:View> 

Button code i开发者_运维百科s here:

       <div class="divPrinter">
        <asp:DropDownList runat="server" class="dropDownList" Width="250" Height="35" 
            ID="cbPrinters" style="margin-top:80px"/>
        <asp:Button ID="btnPrint" runat="server" class="btnPrint" style="margin-top:80px"
            Width="120" Height="35"  Text="Print" onclick="BtnPrintClick"  />
        </div>

I take it you don't want the Enter key to have any effect? If so, add this tag to your textboxes:

onKeyDown = "return (event.keyCode != 13)"

so it would be like this:

<asp:TextBox ID="bl_tb_barcode" runat="server" BorderWidth="1px" 
     class="textBox"  Width="700" onKeyDown="return (event.keyCode != 13)"/>

As a side note, onKeyDown is a Javascript event, so it won't execute on the server. The code will return false so a postback will not occur.