Hello Chom,
The new ToColumn(columnName, tableName) method is defined as an extension method in the
Telerik.OpenAccess.Metadata.Fluent.Advanced namespace.
Please make sure you have added an using statement to that namespace.
I hope that helps. Do not hesitate to contact us if you have other questions.
All the best,
Kaloyan Nikolov
the Telerik team
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