（提供者：命名管道提供程序，错误：40-无法打开与SQL Server的连接）

Question

Additional information: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) .

I'm trying to connect to my online database from my vb website project but always getting the error above

i tried to change the server name to an ip,localhost but still the same problem !

my connecting string

cnn.ConnectionString = "server=mrsandg.com; user=username ;password=password ;Database=my_db;"

i checked

Connecting to a Online MySQL Database using VB.Net

SqlConnection error Named Pipes Provider

https://www.daniweb.com/programming/software-development/threads/488146/how-to-connect-vb-net-on-a-online-database

Answer 1

Your problem is that you are using a System.Data.SqlClient.SqlConnection in an attempt to connect to a MySql server.

To connect to MySql you need to use a MySqlConnection which will require you adding a reference MySql provider for Ado.Net called MySql.Data

The easiest way to do this is by using NuGet Package Manager. In Visual Studio Click: Tools > NuGet Package Manger -> Manage Nuget Packages For Solution.

In the form, click on Browse and select MySql.Data.

Note: there is also an EntityFramework provider if you wish to use that instead of Ado.Net.

From Here, check the projects you want to use the provider in and click install.