C# : Linq-to-sql error: 'int[]' does not contain a definition for 'Contains'

C# : Linq-to-sql error: 'int[]' does not contain a definition for 'Contains'
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C# : Linq-to-sql error: 'int[]' does not contain a definition for 'Contains'
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not Linq-to-sql 'Contains' for a C# 'int[]' error: does contain definition :