Eventually, this is where your validation logic will lie. There's a great example of binding a list to a datatable and datagridview on dotnetpearls.So, we've gotten all of the from outside of the form and injected it in. Well, we'll add some to the interface for the presenter to respond to. It catches the raised event, and interacts with the View's interface, performing this work.It is the typical operations performed on set of data) You can then test the implementation of your Now with all the parts in place it is easy test that the View can request all the data.You can easily select one of those bits of data (any row of your fake data), and perform what you need and want all in memory so you don't have to worry about connection strings, and setting up the tables correctly etc etc. from here you get the benefit of knowing your presenter populates your view with the correct data when needed. Add("Price", "Price") '---create a new bindingsource control--- Dim bindingsource As New Binding Source '---add the items into the control--- bindingsource. Header Text = "Types" '---data bind it--- combo Box Col. Add("Type C") '---create a combobox column--- Dim combo Box Col As New Data Grid View Combo Box Column '---set the header--- combo Box Col.
If the Combo Box control is bound to a data source, you will not be able to add new items into it during runtime. Next, service the Cell Validating event of the Data Grid View control. _ Data Grid View Cell Validating Event Args) _ Handles Data Grid View1. First, service the Cell Validating event, which is fired when the user has finished modifying the value of a cell and leaves the cell: Private Sub Data Grid View1_Cell Validating( _ By Val sender As Object, _ By Val e As System. This means, that you can now relatively simply test your code. Moq makes it easy to mock out the view and test the presenter. Your Form (IParts View) needs to be with this pattern before trying to refactor to it with this monolithic code behind that you have there.I fear that if you try without having a simpler experience first, that you'll fail and never learn how powerfully awesome this pattern can be in your code. To expand on Rubber Ducks answer, about adding tests first is great!There are two flavors, passive and supervising controller.The very first thing you need to do is make sure that your form is not responsible for retrieving the Data Table. The Presenter should be responsible for providing it to the View.
An alternative way would be to add the items to the Data Grid View Combo Box Column control directly, as shown: '---adding columns--- Data Grid View1.