在现有数据集上插入行

Question

I have a dataset called "titulos" and have 1 table there called "tb" with the columns with the name "titulo","titulo 2" and "titulo3". I'm trying to do an insertion of rows in the event onclick of a button but for some reason my code doesn't work! My dataset is on a xsd file and I am using visual studio 2013 with c#. I already tried this code but I don't know how to apply in my situation:

NorthwindDataSet.CustomersRow newCustomersRow = 
northwindDataSet1.Customers.NewCustomersRow(); 
newCustomersRow.CustomerID = "ALFKI"; 
newCustomersRow.CompanyName = "Alfreds Futterkiste"; 
northwindDataSet1.Customers.Rows.Add(newCustomersRow);

The problem is that shows an error saying it does not recognize the dataset... The erros is : "The name " Ds_Admissibilidade" does not exist in the current context

Answer 1

A DataSet is a disconnected copy of the data. It forgets if the data originated from database, an xml file or anything else. When you add rows to the DataSet , you only change the in-memory copy, not the original source.

You need some mechanism to update the source. For databases, a table adapter or dataadapter will do this for you. For a file source, you need to serialize the DataSet to the file, much the reverse of the way you read in in first place.

Answer 2

Hope this helps :)

        DataRow newRow = titulos.Tables["tb"].NewRow();
        newRow["titulo1"] = "titulo1";
        newRow["titulo2"] = "titulo2";
        newRow["titulo3"] = "titulo3";

        titulos.Tables["tb"].Rows.Add(newRow);

Make sure you're setting all the values of the non nullable parameters. If you're using another instance of the dataset "titulos" use ImportRow instead of Add function.