update using sqlcommandbuilder

Hi

I am facing an issue in update query using sqlcommandbuilder class when I check the update command I find this command

UPDATE [subjects1] SET [SubjectCode] = @SubjectCode, [SubjectText] = @SubjectText, [IsSubjectActive] = @IsSubjectActive WHERE (([SubjectID] = @Original_SubjectID) AND ((@IsNull_SubjectCode = 1 AND [SubjectCode] IS NULL) OR ([SubjectCode] = @Original_SubjectCode)) AND ((@IsNull_SubjectText = 1 AND [SubjectText] IS NULL) OR ([SubjectText] = @Original_SubjectText)) AND ((@IsNull_IsSubjectActive = 1 AND [IsSubjectActive] IS NULL) OR ([IsSubjectActive] = @Original_IsSubjectActive)))

but my table only contains the columns SubjectId, SubjectCode,SubjectText and IsSubjectActive from where does rest of the columns came

Regards
Karan Gupta