How to make LINQ use column default values?

I have a table with four columns.  One column is a datetime, which uses the SQL Server function getdate() for the column's default value.  When I drop this table onto my DBML in .NET, all four columns appear.  

I never explicitly supply a value for the datetime column on inserts in .NET (C#) since I want to use the default provided from above in SQL Server.  I have to delete the datetime column from the DBML since it breaks inserts.  I get the SQL error that my date is out of range, since .NET, I assume, is trying to supply a datetime value for that column, rather than letting SQL Server do it.  

The datetime column is needed for LINQ selects but not inserts.  So, I do need the datetime column in the DBML for selects.  How can I get around this issue so that the SQL Server default value is used on inserts, yet I can access the column for selects?  Others entities, such as an SQL Server job may insert into this table.  So the default of getdate() is necessary.
brettrAsked:
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jinalCommented:
Hello ,

Just do one thing . open dbmp file  then click on date column and select auto generated value to true.

Please look at attached image.

linq-date-setting.JPG
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