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Editorial Team
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Asked: 2026-05-16T08:23:26+00:00

I’m Developing a small windows application in C#.net in Visual Studio 2010 with framework

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I’m Developing a small windows application in C#.net in Visual Studio 2010 with framework 3.5. I use LinqToSql for database manipulation.

table name: cprofile

Fields of the table are:

custid                int (primary key),
custname              varchar(50),
address               nvarchar(MAX),
mobileno              nchar(10)

So i have changed the 'Is identity' property of the 'cust id' to 'yes'. It automatically changes other 2 sub properties.

Identity Increment =   1
Identity Seed  =      1,

After these changes have been made in the table, it throws error when I try to save a new record.

“Cannot insert explicit value for identity column in table ‘cprofile’
when IDENTITY_INSERT is set to OFF.”

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  1. Editorial Team

    Not too familiar with L2S, but I’d say Daniel is correct: update your model (usually on a context menu somewhere) from the DB. That should prevent it from attempting to insert a value into your auto-incrementing ID column.

    I believe there may be a way to have it set IDENTIY_INSERT ON, but I highly recommend against it.

    If your table should not be in charge of setting the CustomerId (say, the business has some method of making that determination (especially in a non-linear way), leave your Customer Id column as the PK, but remove the Identity specificaiton from the column.

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