"the property 'name' is part of the object's key information and cannot be modified. entity framework" Code Answer
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see the answer from yildizm85 to this question: entity framework not working on table without identity column
"entity framework requires a primary key to generate a model from the database. if there is no primary key on a table it will simply select the non-nullable columns as a concatenated primary key and the entity will be read/only."
looking at your eat_sourcenames object it appears there is no primary key field so the entity framework is using the column 'name' as part of the composite key which means it is read-only.
the solution would be to add a primary key field to eat_sourcenames and then your 'name' field would no longer be part of the primary key.
see the answer from yildizm85 to this question: entity framework not working on table without identity column
"entity framework requires a primary key to generate a model from the database. if there is no primary key on a table it will simply select the non-nullable columns as a concatenated primary key and the entity will be read/only."
looking at your
eat_sourcenamesobject it appears there is no primary key field so the entity framework is using the column 'name' as part of the composite key which means it is read-only.the solution would be to add a primary key field to
eat_sourcenamesand then your 'name' field would no longer be part of the primary key.