C# : Unable to cast object of type 'System.Data.Linq.DataQuery`1[System.Int32]' to type 'System.ICon

C# : Unable to cast object of type 'System.Data.Linq.DataQuery`1[System.Int32]' to type 'System.IConvertible'
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C# : Unable to cast object of type 'System.Data.Linq.DataQuery`1[System.Int32]' to type 'System.IConvertible'
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Unable cast to of type 'System.IConvertible' 'System.Data.Linq.DataQuery`1[System.Int32]' : C# object to type