后台是asp.net
<div class="form-file">
<label>
经营区域</label>
<div class="form-file-box"><%--datatype="null"--%>
<asp:TextBox ID="txt_ManagementArea" runat="server" CssClass="form-input" ></asp:TextBox>
<span class="Validform_checktip"></span>
</div>
</div>
后台要加
if (!IsPostBack)
{