Update table with textbox.DataBindings

Question

Hello. I'm trying to figure out how to view the data and update it.

 

The problem is that it does not update

 

ds = new DataSet("Tab_Clienti");

da1 = new SqlDataAdapter("SELECT * FROM Tab_Clienti", Utility.ConnSQL);

//da1.TableMappings.Add("Table", "Tab_Clienti");

da1.Fill(ds, "Tab_Clienti");

txtRagione.DataBindings.Add(new Binding("Text", ds, "Tab_Clienti.Ragione", false, DataSourceUpdateMode.OnPropertyChanged ));

up to here everything is ok, I see the data

 

edit textbox and click button

 

da1.UpdateCommand = new SqlCommandBuilder(da1).GetUpdateCommand();

da1.Update(ds,"Tab_Clienti");

 

update does not work