C＃TableAdapter不插入和更新

Question

I have a database called DB.mdf, in my program I use this code to insert a new row in this database:

DBDataSet ds = new DBDataSet();
DBDataSetTableAdapters.IPTableAdapter ipadap = new DBDataSetTableAdapters.IPTableAdapter();

ipadap.InsertQuery(ip);

InsertQuery is: INSERT INTO [IP] ([ID], [indirizzo]) VALUES (0, @indirizzo);

The program executes all steps, but not inserts the row on database. Why?

UPDATE Now I have tried this code:

DBDataset.IPRow newRegionRow;
newRegionRow = db.IP.NewIPRow();
newRegionRow.ID = "6";
newRegionRow.indirizzo = "NorthWestern";
// Add the row to the Region table
this.db.IP.Rows.Add(newRegionRow);
// Save the new row to the database
this.ipadap.Update(this.db.IP);

And in this case not write a new row in database

Answer 1

I have found the error!!! I didn't know that Visual Studio, during develop, create a copy of database in /bin and it work with the copy of database.

Thanks to all.

https://msdn.microsoft.com/en-us/library/ms246989.aspx