In our previous tutorial I discuss on “How to Create Master/Detail Windows Forms” on our Library System Project.

Today we will add MDI Form and create a main menu to open the forms on our project. If you follow closely this tutorial you will have now several Windows Forms on your project.

Please follow the steps below to Add MDI Form and Main Menu on your Library System project.

If you are using SelectedIndexChanged in your ComboBox may be you encounter a problem with events being fired even if you did not click the ComboBox.

This happens when you open and close your Windows Form. The workaround for this is to use RemoveHandler statement.

Here’s an example: RemoveHandler CreditTermIDComboBox.SelectedIndexChanged, AddressOf CreditTermIDComboBox_SelectedIndexChanged

And when you’re done executing the Form Load event you have to add back the handler again by using the AddHandler statement.

Here’s an example:

On my last tutorial I discuss on “How to Display Data in Windows Forms”. This time I will teach you on “How to Create Master/Detail Windows Forms”.

Creating a master/detail form still requires the same method as displaying data in windows forms. Except that we use additional control called “DataGridView”. This control will display the related record known as child form.

One of the challenging parts in VB.NET is to change the connection string of your database location when you run your application.

This tutorial will help you solve this problem. This will apply only to SQL Server but it can be also modified easily to work with MS Access and other DBMS.

In my case I initialize this on the Form Load event on my Login form.