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Response Field to check: Body
Reference Name: VIEWSTATE
Wiki MarkupRegular Expression: id="_VIEWSTATE" value="(\[\\w/-_\].+)"
Template: $1$
Match No. : 1
Default Value: NOT FOUND

Response Field to check: Body
Reference Name: EVENTVALIDATIONunmigrated-wiki-markup
Regular Expression: id="_EVENTVALIDATION" value="(\[\\w/-_\].+)"
Template: $1$
Match No. : 1
Default Value: NOT FOUND

Then in order to ensure these extracted values are passed in subsequent HTTP requests, for each request specify the following to be the Send Parameters for the Request:

Name: _VIEWSTATE
Value: ${VIEWSTATE}
Name: _EVENTVALIDATION
Value: ${EVENTVALIDATION}

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