How to Fix Missing Microsoft ActiveX Data Objects 6.1 Library
Microsoft ActiveX Data Objects (ADO) is a technology that enables your client applications to access and manipulate data from a variety of sources through an OLE DB provider. ADO supports key features for building client/server and Web-based applications, such as connection pooling, disconnected recordsets, and batch updates.

However, sometimes you may encounter an error message that says "Missing Microsoft ActiveX Data Objects 6.1 Library" when you try to use ADO in your Visual Basic project. This means that the ADO 6.1 library is not registered on your system, or that the reference to it is broken in your project.

Missing Microsoft Activex Data Objects 61 Library
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To fix this problem, you can try the following steps:

Make sure that you have installed the latest version of ADO 6.1 on your system. You can download it from here.
Open your Visual Basic project and go to Tools > References. Look for "Microsoft ActiveX Data Objects 6.1 Library" in the list of available references.. If it is checked, uncheck it and check it again. If it is not checked, check it and click OK.
If you still see the error message, go to Tools > References again and click on Browse. Navigate to the folder where you installed ADO 6.1 (usually C:\Program Files\Common Files\System\ado) and select msado15.dll. Click OK and then OK again.
Save your project and run it again. The error message should be gone.

If none of these steps work, you may need to reinstall ADO 6.1 or contact Microsoft support for further assistance.
ADO is a set of objects that expose a common interface for accessing data from different sources. The main objects are:

Connection: Represents a connection to a data source, such as a database or a file.
Command: Represents a command or a query that can be executed on a data source.
Recordset: Represents a set of records that result from executing a command or a query.
Field: Represents a column or an attribute in a recordset.
Property: Represents a property or an option that can be set or retrieved for an object.
Error: Represents an error that occurs during an operation.

ADO also supports some additional objects, such as Parameter, Stream, and Record, that provide more functionality for specific scenarios.

To use ADO with different data sources, you need to specify the appropriate OLE DB provider for the data source in the connection string. A connection string is a string that contains information about how to connect to a data source, such as the server name, the database name, the user name, the password, and the provider name. For example, to connect to a SQL Server database using ADO, you can use the following connection string:

"Provider=SQLOLEDB;Data Source=MyServer;Initial Catalog=MyDatabase;User ID=MyUser;Password=MyPassword;"
You can find more information about connection strings and OLE DB providers on this website.
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