The DataAdapter.SelectCommand property needs to be initialized - ado.net

Question

I want to save the modifications I made to a DataSet into the DataBase, but I got this error:
The DataAdapter.SelectCommand property needs to be initialized
This is the code I wrote:
dr = dt.NewRow
dr(0) = t1.Text
dr(1) = t2.Text
dr(2) = t3.Text
dr(3) = d1.Value
dt.Rows.Add(dr)
da.InsertCommand = cb.GetInsertCommand()
da.Update(ds, "stagiaire")
MsgBox("ajout effectu!")
dr is a DataRow / dt is a DataTable / da is a SqlDataAdapter / cb is a SqlCommandBuilder / ds is a DataSet
But when I changed this line : da.InsertCommand = cb.GetInsertCommand() with : cb = New SqlCommandBuilder(da) it worked.
So why the first code I used it didn't worked !

Answer 1

Either you do it like this
dr = dt.NewRow
dr(0) = t1.Text
dr(1) = t2.Text
dr(2) = t3.Text
dr(3) = d1.Value
dt.Rows.Add(dr)
SqlComand cmd=new SqlCommand("insert query",conn)
da.InsertCommand = cmd
da.Update(ds, "stagiaire")
MsgBox("ajout effectu!")
OR
dr = dt.NewRow
dr(0) = t1.Text
dr(1) = t2.Text
dr(2) = t3.Text
dr(3) = d1.Value
dt.Rows.Add(dr)
SqlCommandBuilder cb=new SqlCommandBuilder (da)
da.InsertCommand = cb.GetInsertCommand()
da.Update(ds, "stagiaire")
MsgBox("ajout effectu!")