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Review the Tutorial. Share Twitter Facebook. To see the result of our code so far, we can click on Debug, and then Start Without Debugging. Pretty Sweet! We got our first C console application to run. Visual Studio automatically compiled the source code and launched the program in a new console window.
The program can also be run from the command line by typing the name of the executable, WelcomeToCSharp. Here is how we can do that. Now, we can run the program again from the command line and pass in a string parameter like so. Note that when specifying the name of the program, you can omit the. Just for grins, we can run it again and pass in a different string parameter just to see it in action. We get a nasty error message, and the program crashes. Here is the updated code. Below we run the program once with no argument, then again with an argument. Another approach we could take to the program is to prompt the user for information while the program is running.
We can do this with the Console. ReadLine method.
Create a "What Is Your Name" application
Now when the program runs, we are prompted to enter some data. The program does not move forward until we do so. Now, we can enter a name when prompted and the program responds accordingly.
Now, we want to ask the user if they had their breakfast today. Our modified code now will look like this. 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. These will both be drop downs and the datasets you have created will be selectable.
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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. 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:.
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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