yes/no fields not working in sql

I had an access database which I have had to move to sql.  I am accessing it through an access front end -( .mdb not adp) with an odbc connection.  I had alot of fields in my access database which were yes/no fields and my forms had check boxes for them.  Since moving my database to sql the values are still there, ex: the yes shows up as -1 and nos show as 0.  They are bit datatypes in the sql database and yet still show as yes/no fields inn the access front end.  However, my check boxes don't work anymore.  Here is the criteria that I had on each check box (with different field names.)
IIf([Forms]![FrmMain]![chkNCRC]=Yes,Yes,Null)
They worked great before.  How can I get them working now that my db is in sql?
Thanks,
Karen
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ksilvosoAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
you will have to use the -1 (true) and 0 (false) explicitely:
IIf([Forms]![FrmMain]![chkNCRC]=-1,Yes,Null)
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Make sure your Access checkboxes do NOT have the Triple State property set to Yes, which allows Yes, No, and NULL.
Then, go into your SQL table, bit column, and run an UPDATE query to convert any NULL values to Yes or No (whichever you prefer)

Last I remember there is a known issue with SQL bit fields, where when you enter a NULL value in a record it locks that table for future editing.
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ksilvosoAuthor Commented:
angellll,
  I tried that and it still doesn't work.  Should the field type be something other than bit?
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ksilvosoAuthor Commented:
I changed it to this and it works now.  Thanks!
IIf([Forms]![FrmMain]![chkNCRC]=-1,1,Null)
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