Visual Basic .Net: a beginners guide


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The important lines in filling the data are the two listed in red. The other line that was critical to using the combo box to navigate records was the line in green. The binding manager tracks the position or row of data that the application is currently viewing or potentially editing. You should also notice the Me. SetEntryControls False line of code. This is calling another sub routine that sets the enabled or disabled status of certain controls on the form.

Each control could be listed individually, but if you have several controls that are always going to be enabled or disabled as a group then making a separate sub for that update will make it easier for you to enable and disable them throughout your application. Actually binding data to a control is very easy in the IDE.

Just select the control on the form and then go to the properties pane and select the DataSource and the display member.


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These will both be drop downs and the datasets you have created will be selectable. The DataSource is the name of your Dataset. Table so in the case of my category combo box the DataSource was DsCategories. The Display member is the actual field in the table that you want to be bound to that field and displayed. In the Recipe application that was category. In order to get this the selected category has to be passed to the DataAdapter that populates the Recipe DataSet. To do that I used the code below:.

The code above clears and refills DsRecipes1. The line in red sends a value to the DataAdapter which is parameterized. The remainder of the application uses the binding manager and bound controls to navigate through the data, edit the data or add new data.

14 Best Visual Basic Books For Beginners

The important thing to remember when you are trying to add, delete, or edit data is that your application is working with its own DataSet not the actual database. To update the data you must use a command to take the current dataset and update the database with it. Here is the code that I used to accomplish this:.

This code is included in the update and delete button code of the Recipe Application code. Below is the code for the delete button so you can see it in action:. Adding data is done by first clearing the fields and then using the BindingManager to add a new row. Then the user must fill out the text fields and click the update button. The code for the Add button and Update button is below:.

Make your program appear to do lots of things at the same time

That covers the basics of how to use your data connections, data adapters, and data sets to retrieve, navigate, add, delete and update data. I hope that these simple instructions have helped you gain a better understanding of how to manipulate a DataSet. Please feel free to write me or post your comments here about your experiences. There will be more of these beginner type articles as well as book reviews from a beginner's perspective to help guide those of us that are new to the world of Visual Basic.

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NET applications. Some of the major topics we cover include what you can build with VB. By the end of this course, you'll have gained the knowledge necessary to create great.


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Start a FREE day trial. Play course overview. Course info Level. May 21, Course Overview. It is never too late to start learning and it would be a shame to miss an opportunity to learn a tutorial or course that can be so useful as VB. NET Programming especially when it is free! You do not have to register for expensive classes and travel from one part of town to another to take classes. All you need to do is download the course and open the PDF file.

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Visual Basic .Net: a beginners guide Visual Basic .Net: a beginners guide
Visual Basic .Net: a beginners guide Visual Basic .Net: a beginners guide
Visual Basic .Net: a beginners guide Visual Basic .Net: a beginners guide
Visual Basic .Net: a beginners guide Visual Basic .Net: a beginners guide
Visual Basic .Net: a beginners guide Visual Basic .Net: a beginners guide
Visual Basic .Net: a beginners guide Visual Basic .Net: a beginners guide
Visual Basic .Net: a beginners guide Visual Basic .Net: a beginners guide
Visual Basic .Net: a beginners guide Visual Basic .Net: a beginners guide
Visual Basic .Net: a beginners guide

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