Dec 07, 2021 · so, i have written below code. var isExist = from row in taskList select new. {. task = row.taskStart.Contains( (from item in hostelStops select item.hostelName )) }; but, receiving error as. Error CS1929 'IEnumerable<string>' does not contain a definition for 'Contains' and the best extension method overload 'MemoryExtensions.Contains<IEnumerable<string>> (ReadOnlySpan<IEnumerable<string>>, IEnumerable<string>)' requires a receiver of type 'ReadOnlySpan<IEnumerable<string>>'.. "/>
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