converting toList() throws exception Object must implement IConvertible

I am getting this开发者_JAVA技巧 exception "Object must implement IConvertible." while converting rules to tolist(). below is my code

var rules = from m in db.Rules select m;
 return rules.ToList().ToDataTable(); // exception occurs here

I am using MySQL 6.3.6 ..the same code is working fine with MSSQL.

I will be grateful if someone helps me in this

regards Umair

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Make sure the source type is convertible to the destination type.
Probably the rules.ToList() don't match with you ToDataTable destination cast.

Can you verify what var list = rules.ToList() contains?

And... I suggest deal with List and IEnumerable against Datatable.