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我從後面的代碼中顯示requiredfieldvalidator的錯誤消息,但顯示設置爲無或隱藏可見。我試圖做.visible = true,但它仍然隱藏。我怎樣才能讓它顯示錯誤信息?該文本框位於GridView中。從代碼背後啓用RequiredFieldValidator
<asp:TemplateField HeaderText="SSN">
<ItemTemplate>
<asp:TextBox ID="txtSSN" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtSSN" />
</ItemTemplate>
</asp:TemplateField>
TextBox txtSSN = (TextBox)r.FindControl("txtSSN");
if (txtSSN.Text == "")
{
RequiredFieldValidator RequiredFieldValidator1 = (RequiredFieldValidator)r.FindControl("RequiredFieldValidator1");
RequiredFieldValidator1.Visible = true;
RequiredFieldValidator1.Enabled = true;
RequiredFieldValidator1.ErrorMessage = "This field is required.";
}