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private IEnumerable GetDataSource(string tableName)
{
DataClasses1DataContext db = new DataClasses1DataContext();
var metaTable = db.Mapping.GetTables().Where(o => o.TableName == tableName).SingleOrDefault();
var table = db.GetTable(metaTable.RowType.Type);
IEnumerable query = db.ExecuteQuery(table.ElementType, "select top 5 * from " + tableName);
return query;
}