c# - How to insert data into sql server database when the primary key column already set default identity(1, 1) -


i'm trying insert 2 data columns sql server database error @ code line -> cmd.executenonquery();

cannot insert value null column orderid, table restaurantapp.dbo.junc_order; column not allow nulls. insert fails.

the orderid column primary key in data table. set identity(1, 1) , want insert other data , meanwhile can insert 1, 2, 3, 4....automatically.

here part of code:

string insertstring = "insert junc_order(id, quantity)values (@id, @quantity)"; sqlcommand cmd = new sqlcommand(insertstring, conn); cmd.parameters.addwithvalue("@id", r_id); cmd.parameters.addwithvalue("@quantity", r_quantity); cmd.executenonquery();

i connection database ahead of these codes, problem should not that.

updated junc_order table design:

orderid (pk,fk,int,not null)  id(fk,int,not null)  quantity(int,not null)

by viewing question, seems insert query not correct:

  1. first of all, don't need insert "orderid" primary key identity sql server automatically insert it.

  2. second, somewhere getting "r_id" null that's why facing error.verify , modify code following:

    string insertstring = "insert junc_order(quantity) values(@quantity)"; sqlcommand cmd = new sqlcommand(insertstring, conn); cmd.parameters.addwithvalue("@quantity", r_quantity); cmd.executenonquery();


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