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Editorial Team
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Asked: 2026-05-23T06:41:59+00:00

I am trying to insert the guestpass type name in table guestpasstypes and at

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I am trying to insert the guestpass type name in table guestpasstypes and at a time it will check the database whether the database has already that name or not by using this statement: 

@"INSERT INTO guestpasstypes(guestPasstype_Name)values('" + tbPassType.Text + "') where not exists (select 'guestPasstype_Name' from guestpasstypes where guestPasstype_Name = '" + tbPassType.Text + "')"

but it accepts the duplicate name too, and it does not work. Would anyone please help on this?

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1 Answer

  1. Editorial Team

    If you want it to throw an error you can either :

    • Put a unique index on the column (the easiest and preferred way)

    or

    • Write a stored procedure which returns an error flag. Within the procedure, you first check for a matching value and if one is found, set the error flag and return. Otherwise do the insert as normal.
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