I am working on an ASP.NET AJAX web application. I got a PageRequestManagerServerErrorException with error code 500 every time when I try to populate a text box with a string contains some HTML tags (like <BR> for example). The full error message "Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500" appears in an alert box from javascript.
The main problem is that every next async post back generates the same error on the client side. Of course, I can check the passing string preliminarily, but my question is:
Is there a way to handle an error like this so the web application continues to run?
I have already check to clear error in Application Context on Application_Error event with Context.ClearError(), but it does not affect.
Hi!,
That exception is a callback exception and the PageRequestManager is the AJAX ScriptManager control.
You could customize the callback errors using the AsyncPostBackErrorMessage property of the ScriptManager.
Also, if you want to handle the error on server-side, use the ScriptManager_AsyncPostBackError event.
Please refer to this:http://support.microsoft.com/kb/193625
Check this articlehttp://blog.g9th.com/2007/01/14/unable-to-validate-data-at-systemwebconfigurationmachinekeysectiongetdecodeddata.aspx
Let me know if you need more info.
You can also see this thread for more help:http://forums.asp.net/t/1115331.aspx
Hi chetan.sarode!
Thank you for your post.
Yesterday I tried to handle this error on ScriptManager_AsyncPostBackError event, but unfortunately it doesn't fire.
The only one event I found to handle is Application_Error on Global.asax. I could ClearError in current HttpContext, but it doesn't affect on client side. The error still apears after every next async post back (the only difference is that alert box in javascript with the error message doesn't appear).
So, is there a way to prevent the response from the server to the client in that case. I mean it is better for me, the server sends nothing to the client instead of an error that stops every next async post back.
I appreciate any advice.
Thanks again.
I will look into that more...
Will let u know
Hi,
I got the same error a few days ago.
The following is my code that got the error:
<%@. Page Language="C#" %>
<%@. Import Namespace="System.Xml" %>
<%@. Import Namespace="System.Data" %>
<%@. Import Namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = DateTime.Now.ToString();//string strxml = "<books><book>asp</book><book>asp1</book><book>asp2</book></books>";
string strxml = HiddenField1.Value;//.Replace("begin", "<").Replace("end", ">").Replace("slash", "/");
//DataSet myDS = new DataSet();
//XmlTextReader xtr = new XmlTextReader(new StringReader(strxml));
//myDS.ReadXml(xtr);
//DropDownList1.DataSource = myDS;
//DropDownList1.DataValueField = "book";
//DropDownList1.DataTextField = "book";System.Xml.XmlDocument sa = new System.Xml.XmlDocument();
sa.LoadXml(strxml);
System.Xml.XmlNodeList saa = sa.GetElementsByTagName("book");
DropDownList1.DataSource = saa;
DropDownList1.DataValueField = "InnerText";
DropDownList1.DataTextField = "InnerText";DropDownList1.DataBind();
}
</script><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title><script language="javascript" type="text/javascript">
// <!CDATA[function Button2_onclick() {
document.getElementById("HiddenField1").value = test.XMLDocument.xml;
// var a = "";
// while(document.getElementById("HiddenField1").value != a){
// var a = document.getElementById("HiddenField1").value;
// document.getElementById("HiddenField1").value = document.getElementById("HiddenField1").value.replace("<","begin");
// document.getElementById("HiddenField1").value = document.getElementById("HiddenField1").value.replace("/","slash");
// document.getElementById("HiddenField1").value = document.getElementById("HiddenField1").value.replace(">","end");
// }
document.getElementById("Button1").click();
}// ]]>
</script></head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList><div style="visibility: hidden">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</div>
<input id="Button2" type="button" value="button" onclick="return Button2_onclick();" />
<asp:HiddenField ID="HiddenField1" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
</div>
<xml id="test">
<books>
<book>asp</book>
<book>asp1</book>
<book>asp2</book>
</books>
</xml>
</form>
</body>
</html>
I resolved it by changing the code into the following code:
<%@. Page Language="C#" %>
<%@. Import Namespace="System.Xml" %>
<%@. Import Namespace="System.Data" %>
<%@. Import Namespace="System.IO" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = DateTime.Now.ToString();//string strxml = "<books><book>asp</book><book>asp1</book><book>asp2</book></books>";
string strxml = HiddenField1.Value.Replace("begin", "<").Replace("end", ">").Replace("slash", "/");
//DataSet myDS = new DataSet();
//XmlTextReader xtr = new XmlTextReader(new StringReader(strxml));
//myDS.ReadXml(xtr);
//DropDownList1.DataSource = myDS;
//DropDownList1.DataValueField = "book";
//DropDownList1.DataTextField = "book";System.Xml.XmlDocument sa = new System.Xml.XmlDocument();
sa.LoadXml(strxml);
System.Xml.XmlNodeList saa = sa.GetElementsByTagName("book");
DropDownList1.DataSource = saa;
DropDownList1.DataValueField = "InnerText";
DropDownList1.DataTextField = "InnerText";DropDownList1.DataBind();
}
</script><html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title><script language="javascript" type="text/javascript">
// <!CDATA[function Button2_onclick() {
document.getElementById("HiddenField1").value = test.XMLDocument.xml;
var a = "";
while(document.getElementById("HiddenField1").value != a){
var a = document.getElementById("HiddenField1").value;
document.getElementById("HiddenField1").value = document.getElementById("HiddenField1").value.replace("<","begin");
document.getElementById("HiddenField1").value = document.getElementById("HiddenField1").value.replace("/","slash");
document.getElementById("HiddenField1").value = document.getElementById("HiddenField1").value.replace(">","end");
}
document.getElementById("Button1").click();
}// ]]>
</script></head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList><div style="visibility: hidden">
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</div>
<input id="Button2" type="button" value="button" onclick="return Button2_onclick();" />
<asp:HiddenField ID="HiddenField1" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
</div>
<xml id="test">
<books>
<book>asp</book>
<book>asp1</book>
<book>asp2</book>
</books>
</xml>
</form>
</body>
</html>
For more information,seehttp://forums.asp.net/t/1126640.aspx(embedded xml datasource)
Thanks
