Errors on Stress Test

[Shabam]

I'm getting the following 2 errors randomly when doing a load test on a web
application's search engine. As far as I know, there isn't writing to the
DB involved when doing searches, so I'm at a loss of why this occurs under
load. I'm not the programmer, but this doesn't seem right. Can someone
help me figure out what is causing this, and what should be done to solve
it?

ERROR 1:

Server Error in '/' Application.
----------------------------------------------------------------------------
----

There is no row at position 8.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.IndexOutOfRangeException: There is no row at
position 8.

Source Error:

An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can
be identified using the exception stack trace below.

Stack Trace:

[IndexOutOfRangeException: There is no row at position 8.]
System.Data.DataView.GetRecord(Int32 recordIndex) +60
System.Data.DataView.IsOriginalVersion(Int32 index) +9
System.Data.DataRowView.GetColumnValue(DataColumn column) +23
System.Data.DataColumnPropertyDescriptor.GetValue( Object component) +25
System.Web.UI.DataBinder.GetPropertyValue(Object container, String
propName) +72
System.Web.UI.DataBinder.GetPropertyValue(Object container, String
propName, String format) +11
System.Web.UI.WebControls.ListControl.OnDataBindin g(EventArgs e) +403
System.Web.UI.Control.DataBind() +26
FN.advancedsearch.populateListcontrols()
FN.advancedsearch.Page_Load(Object sender, EventArgs e)
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750
ERROR 2:

Server Error in '/' Application.
----------------------------------------------------------------------------
----

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set
to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can
be identified using the exception stack trace below.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an
object.]
FN.advancedsearch.populateListcontrols()
FN.advancedsearch.Page_Load(Object sender, EventArgs e)
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750

[Shabam]

I'm getting this error also when load testing:
Server Error in '/' Application.
----------------------------------------------------------------------------
----

Value cannot be null. Parameter name: container
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Value cannot be null.
Parameter name: container

Source Error:

An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can
be identified using the exception stack trace below.

Stack Trace:

[ArgumentNullException: Value cannot be null.
Parameter name: container]
System.Web.UI.DataBinder.GetPropertyValue(Object container, String
propName) +186
System.Web.UI.DataBinder.GetPropertyValue(Object container, String
propName, String format) +11
System.Web.UI.WebControls.ListControl.OnDataBindin g(EventArgs e) +403
System.Web.UI.Control.DataBind() +26
FN.advancedsearch.populateListcontrols()
FN.advancedsearch.Page_Load(Object sender, EventArgs e)
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750

[Bob Grommes]

Just a stab in the dark, but any time you get random errors under load in a
web app and those errors are connected with missing objects or null
references, the first thing that comes to my mind is, are you caching any
objects? If so, look out for constructs like this:

if (myCache.Contains(somekey)) {
// get the value out of the cache and do something with it
}

Under load, it's possible for the cache to expire between the "if" test and
the retreival. A better pattern is:

someType myVar = myCache[somekey];

if (myVar != null) {
// do something with it
}

--Bob

"Shabam" <ch*****@yomama-nospam.com> wrote in message
news:M7********************@adelphia.com...

I'm getting the following 2 errors randomly when doing a load test on a
web
application's search engine. As far as I know, there isn't writing to the
DB involved when doing searches, so I'm at a loss of why this occurs under
load. I'm not the programmer, but this doesn't seem right. Can someone
help me figure out what is causing this, and what should be done to solve
it?

ERROR 1:

Server Error in '/' Application.
----------------------------------------------------------------------------
----

There is no row at position 8.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.IndexOutOfRangeException: There is no row at
position 8.

Source Error:

An unhandled exception was generated during the execution of the current
web
request. Information regarding the origin and location of the exception
can
be identified using the exception stack trace below.

Stack Trace:

[IndexOutOfRangeException: There is no row at position 8.]
System.Data.DataView.GetRecord(Int32 recordIndex) +60
System.Data.DataView.IsOriginalVersion(Int32 index) +9
System.Data.DataRowView.GetColumnValue(DataColumn column) +23
System.Data.DataColumnPropertyDescriptor.GetValue( Object component) +25
System.Web.UI.DataBinder.GetPropertyValue(Object container, String
propName) +72
System.Web.UI.DataBinder.GetPropertyValue(Object container, String
propName, String format) +11
System.Web.UI.WebControls.ListControl.OnDataBindin g(EventArgs e) +403
System.Web.UI.Control.DataBind() +26
FN.advancedsearch.populateListcontrols()
FN.advancedsearch.Page_Load(Object sender, EventArgs e)
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750
ERROR 2:

Server Error in '/' Application.
----------------------------------------------------------------------------
----

Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set
to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current
web
request. Information regarding the origin and location of the exception
can
be identified using the exception stack trace below.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an
object.]
FN.advancedsearch.populateListcontrols()
FN.advancedsearch.Page_Load(Object sender, EventArgs e)
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750