C# : linq Can't perform Create, Update, or Delete operations on 'Table(req)' because it has no prima

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C# : linq Can't perform Create, Update, or Delete operations on 'Table(req)' because it has no primary key
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C# : linq Can't perform Create, Update, or Delete operations on 'Table(req)' because it has no primary key
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'Table(req)' linq or operations : because perform Create, key Can't Update, has no C# Delete primary on it



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