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<EditItemTemplate>
<asp:TextBox ID="PhotoInfo" runat="server" Text='<%#Eval("ImgInfo") %>'></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="PhotoInfo"
ValidationGroup="Group1">*</asp:RequiredFieldValidator>
</EditItemTemplate><asp:EditCommandColumn ButtonType="LinkButton" EditText="编辑" CancelText="取消" UpdateText="更新"
ValidationGroup="Group1"></asp:EditCommandColumn>
if (e.Item.ItemType == ListItemType.EditItem)
{
RequiredFieldValidator re = new RequiredFieldValidator();
//re.ControlToValidate = ((TextBox)e.Item.FindControl("PhotoInfo")).ID;
re.ControlToValidate = "PhotoInfo";
re.Text = "*";
re.Display = ValidatorDisplay.Dynamic;
re.ErrorMessage = "请输入内容";
//re.ValidationGroup = "Group1";
// e.Item.FindControl("PhotoInfo").Controls.Add(re);
e.Item.Cells[2].Controls.Add(re);
}