Can't perform Create, Update or Delete operations on Table because it has no primary key

Question

I\'ve been trying to insert row in the table having an identity column RequestID (which is primary key as well)

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Answer 1

Delete the table and then reinsert it. You must make sure there is a little small key next to the field before you do this. Recompile your project and all should be fine.

Just because you updated the dabase does not mean the DBML file somehow automatically updated. It does not, sorry.