ASP.NET textbox multiline not allowing Enter Key

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ASP.NET4

I have usercontrol with asp:Textbox with multiline textmode property set.
Users want to enter names per line.
when user hit enter control is not moving to next line.

Where as i have similar kind of usercontrol which is working perfect, allows to enter key.

Has any one have solution how to fix this issue.


code
default.aspx

<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default" Title="Updating" %>
<%@ Register Src="~/UserControls/ctrl1.ascx" TagName="Control" TagPrefix="uc10" %>

<asp:Content ID="Content1" ContentPlaceHolderID="cphMain" Runat="Server">
  <table>
<tr>
                            <td>
                                <uc10:Control ID="Control1" runat="server" />
                            </td>
                        </tr>
                    </table>
</asp:Content>

Control.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Control.ascx.cs" Inherits="Default_Control" %>

  <table>
<td colspan="2"><b>Prevent Send List</b><asp:TextBox ID="txtPrev" runat="server" Rows="23"
                            TextMode="MultiLine" Wrap="true" Width="95%" ></asp:TextBox>

</td>


        </tr>
        </table>