Connect sql database file in asp.net

Wherever this article indicates to grant permissions to the impersonated user, grant those permissions to this group instead. If any of these accounts is a local account to the IIS computer, you must replicate each local account on the remote Access computer. Integrated Windows authentication This authentication method only works if your network is set up to use Kerberos authentication and if the computers and accounts are set up as trusted for delegation.

NET to impersonate a specific domain account that has the necessary access permissions on the remote computer. However, this method requires that you store the user name and password in clear text on the server. Regardless of the impersonation or authentication settings, there are other, less common ways to run as a user account.

The following list outlines two of these alternate methods, though details for these methods are beyond the scope of this article. You must then configure the Component Services settings for that component so that it runs as its own process server library. On the Identity tab in Component Services, specify the user account that you want to use. Impersonation application programming interfaces You can create an ActiveX DLL that uses application programming interfaces APIs to switch from the user account that is currently in use to any other account.

You can then use the Access database while you run as this other user. The Microsoft Jet database engine writes temporary files to the Temp folder on the local computer which is the IIS server in this case. You must set the appropriate permissions for this Temp folder.

These variables are often already configured for interactive users on the computer. If this variable does not exist, follow these steps to add it:. However you choose to impersonate accounts within ASP. NET, if the file system on the remote computer is NTFS, you must set the permissions on the remote computer correctly.

For example, you must set the following permissions on the database file:. If there are multiple possible user accounts, such as in Basic or Digest authentication, create a group, add the user accounts to this group, and then grant privileges to the group. Like NTFS file system permissions, you must also set share permissions to allow access for the same user, users, or group. To select the table rows to display, you use a SQL statement, which is a command that you pass to the database.

In the first code block, you open the SmallBakery. The Database. Open method assumes that the. Notice that you don't need to specify the. NET that's used to store data files. For more information, see Connecting to a Database later in this article.

You then make a request to query the database using the following SQL Select statement:. In the statement, Product identifies the table to query. You could also list columns individually, separated by commas, if you wanted to see only some of the columns. The Order By clause indicates how the data should be sorted — in this case, by the Name column.

This means that the data is sorted alphabetically based on the value of the Name column for each row. In the body of the page, the markup creates an HTML table that will be used to display the data. Each time you go through the loop, the next available row from the database is in the row variable you set this up in the foreach statement.

To get an individual column from the row, you can use row. Name or row. Description or whatever the name is of the column you want. Run the page in a browser.

Make sure the page is selected in the Files workspace before you run it. The page displays a list like the following:. SQL is a language that's used in most relational databases for managing data in a database. It includes commands that let you retrieve data and update it, and that let you create, modify, and manage database tables. SQL is different than a programming language like the one you're using in WebMatrix because with SQL, the idea is that you tell the database what you want, and it's the database's job to figure out how to get the data or perform the task.

Here are examples of some SQL commands and what they do:. This fetches the Id , Name , and Price columns from records in the Product table if the value of Price is more than 10, and returns the results in alphabetical order based on the values of the Name column. This command will return a result set that contains the records that meet the criteria, or an empty set if no records match. This inserts a new record into the Product table, setting the Name column to "Croissant", the Description column to "A flaky delight", and the price to 1.

This command deletes records in the Product table whose expiration date column is earlier than January 1, This assumes that the Product table has such a column, of course. The Insert Into and Delete commands don't return result sets. Instead, they return a number that tells you how many records were affected by the command.

For some of these operations like inserting and deleting records , the process that's requesting the operation has to have appropriate permissions in the database.

This is why for production databases you often have to supply a username and password when you connect to the database. There are dozens of SQL commands, but they all follow a pattern like this.

You can use SQL commands to create database tables, count the number of records in a table, calculate prices, and perform many more operations.

This section shows how to create a page that lets users add a new product to the Product database table. After a new product record is inserted, the page displays the updated table using the ListProducts. The page includes validation to make sure that the data that the user enters is valid for the database. For example, code in the page makes sure that a value has been entered for all required columns. The body of the page contains an HTML form with three text boxes that let users enter a name, description, and price.

When users click the Insert button, the code at the top of the page opens a connection to the SmallBakery. You then get the values that the user has submitted by using the Request object and assign those values to local variables.

The Validation helper checks that there is a value in each of the fields that you've registered. You can test whether all the fields passed validation by checking Validation. IsValid , which you typically do before you process the information you get from the user:. If all the columns validated none were empty , you go ahead and create a SQL statement to insert the data and then execute it as shown next:. For the values to insert, you include parameter placeholders 0 , 1 , 2.

As a security precaution, always pass values to a SQL statement using parameters, as you see in the preceding example. This gives you a chance to validate the user's data, plus it helps protect against attempts to send malicious commands to your database sometimes referred to as SQL injection attacks.

To execute the query, you use this statement, passing to it the variables that contain the values to substitute for the placeholders:. After the Insert Into statement has executed, you send the user to the page that lists the products using this line:.

If validation didn't succeed, you skip the insert. Instead, you have a helper in the page that can display the accumulated error messages if any :. Notice that the style block in the markup includes a CSS class definition named. In this case, the CSS class specifies that validation summary errors are displayed in red and in bold, but you can define the. View the page in a browser. The page displays a form that's similar to the one that's shown in the following illustration.

Click Insert. The page displays an error message, as shown in the following illustration. No new record is created.

Fill the form out completely, and then click Insert. This time, the ListProducts. After data has been entered into a table, you might need to update it. This procedure shows you how to create two pages that are similar to the ones you created for data insertion earlier. The first page displays products and lets users select one to change. The second page lets the users actually make the edits and save them. Important In a production website, you typically restrict who's allowed to make changes to the data.

For information about how to set up membership and about ways to authorize users to perform tasks on the site, see Adding Security and Membership to an ASP. The only difference between this page and the ListProducts. Osama Hosam Updated date Jun 08, Introduction CarsPortal is a series of tutorials to implement a cars portal for selling used and new cars. From the dialog box that appears, do the following: Click Visual C since C will be used as the coding language of our project Select Web, so our project will be a website application Select ASP.

Here you can see the SQL Server database that is created. Fill in the cars table with three or four types of cars as shown in the following figure 1. Then write the following code: using System; using System. Generic; using System. SqlServerCe; using System. Linq; using System. To connect to the database using the CarsFrm, double-click on the form to open its code editor.

Create an object form the DBConnection class as follows. Web; using System. UI; using System. Data; using System. Forms; Then add the following function.