Update access asp.net

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Saturday, January 11, PM. User posted I don't see any of your screenshots. Not sure if blocked on my side or what That is : dataReader. Wednesday, January 15, AM. User posted Hi, Issue is that you are not executing your update statement.

User posted hi A2H. Sunday, January 12, AM. User posted Hi I0ri, Can you post your sample code here, I can't see the images have your post. Do you have got exception or error message? Best Regards, Terry Guo. Monday, January 13, AM. User posted Thanks for helping Terry! Below is the code! Imports System. EventArgs Handles Me. Request "username" testLabel. Write "Hello JD!

Write sqlStr Try cnn. Write sqlStr cmd. Close cnn. User posted I0ri am pretty sure my code is correct. If this comes from a book, I strongly advice you to buy another one Simply use ExecuteScalar see an example in the link above And the darareader is obly close when counter is 1.

Monday, January 13, PM. Tuesday, January 14, AM. User posted I0ri I am trying to do a simple prototype I understand, but when you start learning bad practice from day1, you'll be doing that for ever. I0ri help me solve my problem with Updating data to the MS access database? NET and C When it doesn't work, you need to tell us more. User posted Hi, 1 Get rid of the empty catch clause: if an exception happens you are ignoring it which make basically impossible to debug your app.

PatriceSc: already removed exception clause but doesn't help. The value is 0 which means no rows is updated. Once i execute my aspx, i always go to my. I have always been using the VS debugger to check line by line but i still can't resolve the problem. Do take a look at my very 1st post screenshot. Tuesday, January 14, PM. Net has the ability to work with a majority of databases.

But with every database, the logic behind working with all of them is mostly the same. This is a free database software provided by Microsoft. Ok, now that we have seen the theory part of each operation.

In our example, we will connect to a database which has the name of Demodb. The credentials used to connect to the database are given below. Step 2 Add the below code which will be used to establish a connection to the database. When the above code is set, and the project is executed using Visual Studio.

You will get the below output. Once the form is displayed, click the Connect button. The output message displayed in the browser will show that the connection to the database is made. Note that the code entered is in continuation to that written for the data connection module. Step 2 In the final step, we will just display the output to the user. Then we will close all the objects related to the database operation. When the above code is set, and the project is run using Visual Studio, you will get the below output.

From the output, you can clearly see that the program was able to get the values from the database. The data is then displayed in the browser to the user. Just like Accessing data, ASP. Net has the ability to insert records into the database as well. The below code snippet will be used to insert an existing record in our database. This is to display the recent table data in the browser.

NET Data Providers. If you're choosing a relational database for an ASP. Some reasons for choosing SQL Server include the following:. See Object-Relational Mappers later in this topic. Visual Studio includes web deployment features that are designed to facilitate deploying SQL Server databases along with web projects. NET membership database by default. Nearly all ASP. Relatively little documentation that would help you get started and resolve difficulties is available for other databases.

NoSQL databases are alternatives to relational databases. NoSQL databases can provide advantages over relational databases for applications that manage large volumes of unstructured data. Providing guidance on choosing a NoSQL database is outside of the scope of this document.

SQL Server Express. The entry-level, free edition of SQL Server. LocalDB is recommended for web development but not for production web applications because it is not designed to work with IIS. Has all the features of Enterprise edition but is licensed only for development and testing, not for production. SQL Server full editions. SQL Server Compact 4. A free, lightweight database engine that you can use in ASP. NET web applications for both development and production.

SQL Server Compact uses a different database engine and. NET data provider than the other editions. NET Web Applications.

Guidance for choosing an edition for your production database is outside the scope of this topic. That choice is generally determined by your production environment, or you're working on an existing application that already has a database. If you need to choose a SQL Server edition for production, see the following resources:.

You don't have to use the same edition of SQL Server in development that you use in production. The choice of SQL Server edition for development depends on your development environment and the edition you choose for your production database:.

If you want to enable multiple developers to work on the same Visual Studio web project, with some of them using Visual Studio and some of them using Visual Studio , see How can Visual Studio and Visual Studio share a project that uses a database? When you use a different database for development than the one you use for production, you have to deploy the database when you deploy publish the web application.

Deploying a database includes creating the production database, creating tables and other objects in the production database, and copying initial data to the database. Visual Studio includes web deployment features that facilitate deploying databases along with web projects.

To read or update data, you can use ADO. The recommended alternative is to let an object-relational mapper ORM framework such as the Entity Framework handle the low-level code that interfaces with an ADO.

NET data provider. If you use ADO. You also have to write code that converts data from the database's format into objects, properties, and collections that you can work with in code. NET directly. In the following example, a school database has an Instructor table, a Course table, and a CourseInstructor association table for the many-to-many relationship between them. To display a list of instructors and the courses they teach, you populate Instructor and Course objects similar to these:.

Notice that not only does much more code have to be written and tested and debugged when you don't use an ORM, but also the code you write is database-specific. This is a simplified example; in a real-world example with more tables, more columns, and more complex relationships, the differences would be much greater. As you can see, an ORM can make you more productive, and your application easier to maintain. NET application that uses a relational database.

The ADO. NET Framework. NHibernate is an open source ORM for the. For new development where you're not constrained by a legacy data access approach, Microsoft recommends the Entity Framework. Except for ASP. Some factors that make the Entity Framework the best choice include the following:.

Microsoft supports and continues to enhance the Entity Framework. Starting with version 6. NHibernate is not supported by Microsoft. NET developer. Because Microsoft continues to focus ORM development efforts on the Entity Framework, Microsoft and third parties continue to produce new tutorials, videos, and books. NET 4.