Visual Basic .NET

Stop SelectedIndexChanged from Firing on Form Load Event

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:

How to Create Master/Detail Windows Forms

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.

How to Change Connection String at Run Time

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.

How to Display Data in Windows Forms

In order to display data in windows forms all you need to do is drag Items from the Data Sources. For more information, see How to Add New Data Source.

Before you drag the Items (i.e. table name) make sure that you select the display type and type of control that you’d like to appear in the Windows Forms.

To do this expand the Item name and the arrow down to select the display type and type of control which you would like to appear.

Display type

NumberBox Toolbox Item

This textbox desined for currency or decimal numbers Number Property for .text property version contains a number DecimalNumber property for decimal places CurrencySymbol property for currency symbol :) Note : this code changed vb 2010 to 2008 Imports SystemImports System.Collections.GenericImports System.ComponentModelImports System.DataImports System.DrawingImports System.TextImports System

How to Debug Visual Studio .NET Project in 64 Bit OS

This tutorial will explain on:

How to Debug Visual Basic .NET and Visual C# project in 64 bit Operating System.

If you are running 32 Bit operating system before and were intrigued to install 64 bit OS to improved performance of your computer, then maybe you are having problems debugging your Visual Studio .NET source code.

I am once having this issue which stops me from debugging all of my VB.NET 2008 source code after I installed Windows 7 64 bit.