后台生成textbox 取值有关问题

后台生成textbox 取值问题
生成后的heml代码
下面是 在现有的文本框中输入3 点击增加  就生成了3行4列textbox
那么点击提交的时候这3行4列textbox值 我怎么取值呢？

<tr>

                <td colspan="8">

                    <input name="TextBox1" type="text" value="3" id="TextBox1" class="textbox" />

                    <input type="submit" name="Button1" value="增加" id="Button1" class="button" />&nbsp;&nbsp;

                    <input type="submit" name="txt_Add" value="数据提交" id="txt_Add" class="button" />

                </td>

            </tr>

            <tr>

                <td colspan="8">

                    <table id="TableUploadlayout" border="0">

<tr>

		<td style="border-width:1px;border-style:solid;">

                        字段1

                            </td><td style="border-width:1px;border-style:solid;">

                        字段2  

                            </td><td style="border-width:1px;border-style:solid;">

                        字段3

                            </td><td style="border-width:1px;border-style:solid;">

                        字段4

                            </td>

	</tr>

              <tr>

		<td style="border-width:1px;border-style:solid;">

                <input name="tbxNameA1" type="text" id="tbxNameA1" /></td>

                <td style="border-width:1px;border-style:solid;">

                <input name="tbxNameB1" type="text" id="tbxNameB1" /></td>