I just came across a way to test a data providers connection string (like a SQL Server database) with the help of a plain text file using Notepad. To investigate and test out if your connection string works, your going to want to create a UDL file. To do this, follow these steps:. Open up Notepad and create an empty text file, then click File - click Save - and save it with the File name: TestConnection.udl to your desktop. Go to your desktop and double-click on the TestConnection.udl file you just created and the Data Link Properties box will popup. Select the Provider tab and Find the provider that you want to connect with and click Next. Now from the Connection tab, select or enter your source/ server name - then enter information to log on to server - and select the database on the server.

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Hi, problem is read conectionstring from a text file.basically when you connect database from server like sql or oracle then we need its credinal details like.

Click Test Connection and click OK to save the file. Note: If errors occur during testing of your connection string, you will get a popup box with the error message. Once, you've successfully tested your connection string, now go and compare the details of your TestConnection.udl with your (website) project connection string to see if they are similiar.

Connection Strings and Configuration Files. 12 minutes to read. Contributors. In this article Embedding connection strings in your application's code can lead to security vulnerabilities and maintenance problems.

Unencrypted connection strings compiled into an application's source code can be viewed using the tool. Moreover, if the connection string ever changes, your application must be recompiled. For these reasons, we recommend storing connection strings in an application configuration file.

Working with Application Configuration Files Application configuration files contain settings that are specific to a particular application. For example, an ASP.NET application can have one or more web.config files, and a Windows application can have an optional app.config file. Configuration files share common elements, although the name and location of a configuration file vary depending on the application's host. The connectionStrings Section Connection strings can be stored as key/value pairs in the connectionStrings section of the configuration element of an application configuration file. Child elements include add, clear, and remove. The following configuration file fragment demonstrates the schema and syntax for storing a connection string.

The name attribute is a name that you provide to uniquely identify a connection string so that it can be retrieved at run time. The providerName is the invariant name of the.NET Framework data provider, which is registered in the machine.config file. Note You can save part of a connection string in a configuration file and use the class to complete it at run time.

This is useful in scenarios where you do not know elements of the connection string ahead of time, or when you do not want to save sensitive information in a configuration file. For more information, see. Using External Configuration Files External configuration files are separate files that contain a fragment of a configuration file consisting of a single section. The external configuration file is then referenced by the main configuration file.

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Storing the connectionStrings section in a physically separate file is useful in situations where connection strings may be edited after the application is deployed. For example, the standard ASP.NET behavior is to restart an application domain when configuration files are modified, which results in state information being lost. However, modifying an external configuration file does not cause an application restart.

External configuration files are not limited to ASP.NET; they can also be used by Windows applications. In addition, file access security and permissions can be used to restrict access to external configuration files. Working with external configuration files at run time is transparent, and requires no special coding. To store connection strings in an external configuration file, create a separate file that contains only the connectionStrings section. Do not include any additional elements, sections, or attributes.

This example shows the syntax for an external configuration file. In the main application configuration file, you use the configSource attribute to specify the fully qualified name and location of the external file. This example refers to an external configuration file named connections.config. Retrieving Connection Strings at Run Time The.NET Framework 2.0 introduced new classes in the namespace to simplify retrieving connection strings from configuration files at run time. You can programmatically retrieve a connection string by name or by provider name.

Note The machine.config file also contains a connectionStrings section, which contains connection strings used by Visual Studio. When retrieving connection strings by provider name from the app.config file in a Windows application, the connection strings in machine.config get loaded first, and then the entries from app.config. Adding clear immediately after the connectionStrings element removes all inherited references from the data structure in memory, so that only the connection strings defined in the local app.config file are considered. Working with the Configuration Classes Starting with the.NET Framework 2.0, is used when working with configuration files on the local computer, replacing the deprecated. Is used to work with ASP.NET configuration files.

It is designed to work with configuration files on a Web server, and allows programmatic access to configuration file sections such as system.web. Note Accessing configuration files at run time requires granting permissions to the caller; the required permissions depend on the type of application, configuration file, and location. For more information, see and for ASP.NET applications, and for Windows applications. You can use the to retrieve connection strings from application configuration files. It contains a collection of objects, each of which represents a single entry in the connectionStrings section. Its properties map to connection string attributes, allowing you to retrieve a connection string by specifying the name or the provider name.

Property Description The name of the connection string. Maps to the name attribute. The fully qualified provider name. Maps to the providerName attribute. The connection string. Maps to the connectionString attribute.

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Example: Listing All Connection Strings This example iterates through the ConnectionStringSettings collection and displays the, and properties in the console window. Note The namespace contains classes that provide additional options for encrypting and decrypting data.

Use these classes if you require cryptographic services that are not available using protected configuration. Some of these classes are wrappers for the unmanaged Microsoft CryptoAPI, while others are purely managed implementations. For more information, see.

App.config Example This example demonstrates how to toggle encrypting the connectionStrings section in an app.config file for a Windows application. In this example, the procedure takes the name of the application as an argument, for example, 'MyApplication.exe'.

The app.config file will then be encrypted and copied to the folder that contains the executable under the name of 'MyApplication.exe.config'.