Does Auto Sync need to be On Insert ?

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Hi ,
1- I creared a dataContext and i get this error for all classes in dbml.
should i set Auto Sync to on insert?

DBML1060: The AutoSync attribute of the Column element 'Id' of the Type element 'Term' needs to be 'OnInsert' when IsDbGenerated and IsPrimaryKey are 'True'.

2- when i want to insert an object to one class i get this error :

Cannot insert the value NULL into column 'Id', table 'HomeWorkSystem.dbo.CourseGroup'; column does not allow nulls. INSERT fails.
The statement has been terminated.

id is auto Generate but at first another column was primary key and then i created Id column and change primary key.

thank you.

Posted 30-May-12 20:16pm

parisa heidari

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Rajesh Kariyavula · Accepted Answer · 2012-05-30T20:56:00

For the first problem:

If the [column] property in your DBML file is set as IsDbGenerated = true then we are specifying that the column is an identity column in the table, it means that when ever you are performing insert operation your DataContext has to fetch the current ID for the record to be saved. And to perform this operation we have to set the AutoSync property as "AutoSync=AutoSync.OnInsert".

For the Second problem:

When you have changed the primary key from one property to another property have the properties like mentioned below are removed. If not removed please remove them.

C#

DbType="UniqueIdentifier NOT NULL",
IsPrimaryKey=true

And check whether ID column is defined as mentioned below as it is auto generated

C#

[Column(Storage="columnName",
        AutoSync=AutoSync.OnInsert,
        DbType="UniqueIdentifier NOT NULL",
        IsPrimaryKey=true, IsDbGenerated=true)]

Hope this helps. If you still have concern, please mention I'll try to resolve them.