User1581072340 posted
Hi,
Below an example of a simple web form with an UpdatePanel, a Button, a Label, a TextBox, and a RequiredFieldValidator. When clicking the button multiple times I can see the memory usage is growing without ever being released.
<%@ Page Language="C#" %>
<!DOCTYPE html>
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "Refreshed at " + DateTime.Now;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
</head>
<body>
<form id="form2" runat="server">
<div style="padding-top: 10px">
<asp:ScriptManager ID="ScriptManager2" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<fieldset>
<legend>UpdatePanel</legend>
<asp:Label ID="Label1" runat="server" Text="Panel created."></asp:Label><br />
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
<asp:TextBox ID="TextBox1" runat="server" Text="abcd"></asp:TextBox>
<asp:RequiredFieldValidator ID="X" runat="server" ControlToValidate="TextBox1"></asp:RequiredFieldValidator>
</fieldset>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>
I think the combination UpdatePanel and RequiredFieldValidator is causing the issue. What I found is that the following collections are growing after every postback:
- Sys.WebForms.PageRequestManager._instance._onSubmitStatements
- document.getElementsByTagName('head')[0].childNodes
I tried it in several ASP.NET version, including 4.5.2, with and without UnobtrusiveValidationMode. I do have some code to work around this issue, but it feels like a hack.
Can anybody tell me if this is a known issue and if there is a good way to work around this. Thanks in advance.
Ronald
