DataGridView Binding Source datacontext.ExecuteQuery allowusertoaddrows disabled

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C#

DataGridView

Using the following code:

IQueryable data = db.ExecuteQuery<mytable>("SELECT * FROM MyTable").AsQueryable();

datagridviewbindingsource.DataSource = data;</mytable>

the datagridview shows mytable just fine, but now the user is not able to add rows.

Using this code:

IQueryable data = (from p in db.MyTable select p);

datagridviewbindingsource.DataSource = data;

the user is able to add rows to the datagridview. Any clue how to make this option available using the first codesnippet?