firstly,  From v In dataContext.VisitAudits Select v is the same as just saying dataContext.VisitAudits

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 Return View(deletedvisits) sets the Model property on the ViewData object to deletedvisits.

so it would be

 For Each v As VisitAudit In ((IEnumerable<VisitAudit>) ViewData.Model )

unless the page derives from ViewPage<IEnumerable<VisitAudit>>, if so you don't need the cast.

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Another way to do it is

ViewData["deletedvisits"] = deletedvisits;
Return View();

 For Each v As VisitAudit In ((IEnumerable<VisitAudit>) ViewData.["deletedvisits"] )