asp.net - Loadtesting vs Threading in IIS 7 & .NET 3.5 SP1 -

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I am running IIS 7. 3.5 SP1

Can someone tell me that this thread is safe because it keeps users unsuccessful under high loads:

Private static zero addQueryStringParameters ( Excelment Input) {NameValueCollection qs = HttpContext.Current.Request.QueryString; XElement queryStringParameters = New XElement ("QueryStringParameters"); (Some string key.) {Try (if string (.nnlacti (key)) - some code qs [key]} cache (exception exception) {- some code}}}

If this thread is safe then why it fail ...?

By the way, the exception I get is: the item reference is not set .

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