fixing width of an particular column in repeater control asp.net

<table>
            <tr style="border-width: 1px; width: 650px; border-color: Black;">
                <td width="350px" height="50px">
                    <asp:TextBox ID="txtFirstName" runat="server" Text='<%# Eval("FirstName") %>' ToolTip='<%# Eval("FirstName") %>'
                        Enabled="true" ReadOnly="true" BorderStyle="None" Width="100px" Height="50px"
                        Font-Bold="True" ForeColor="#000099"></asp:TextBox>
                </td>
            </tr>
        </table>