get two columns

[picasso2]

I have a SL/WPF application that populates a datagrid. The button contains this code:

MyDomainContext context = new MyDomainContext();
dataGrid1.ItemsSource = context.DBTables;
context.Load(context.GetTwoDataBasesQuery());

The DomainServices.cs contains:

public IQueryable<DBTable>GetTwoDataBases()
{
return this.ObjectContext.DBTables;
}
This code works fine but returns all columns in the context
I need to return only two columns so changed is as follows

public IQueryable<DBTable>GetTwoDataBases()
{

        return GetDBTables().Select(m => new { m.col1, m.col2 });
        
    }

But code has errors, does not accept the “return” .
how do I get col1 and col2?
Many thanX