Here is the error message:

Unhandled exception. MySql.Data.MySqlClient.MySqlException (0x80004005): Authentication to host '192.168.0.31' for user 'username' using method 'mysql_native_password' failed with message: Unknown database 'mysql57'
 ---> MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown database 'mysql57'
   at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
   at MySql.Data.MySqlClient.NativeDriver.ReadPacket()
   at MySql.Data.MySqlClient.Authentication.MySqlAuthenticationPlugin.ReadPacket()
   at MySql.Data.MySqlClient.Authentication.MySqlAuthenticationPlugin.AuthenticationFailed(Exception ex)
   at MySql.Data.MySqlClient.Authentication.MySqlAuthenticationPlugin.ReadPacket()
   at MySql.Data.MySqlClient.Authentication.MySqlAuthenticationPlugin.Authenticate(Boolean reset)
   at MySql.Data.MySqlClient.NativeDriver.Authenticate(String authMethod, Boolean reset)
   at MySql.Data.MySqlClient.NativeDriver.Open()
   at MySql.Data.MySqlClient.Driver.Open()
   at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
   at MySql.Data.MySqlClient.MySqlPool.CreateNewPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
   at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
   at MySql.Data.MySqlClient.MySqlPool.GetConnection()
   at MySql.Data.MySqlClient.MySqlConnection.Open()

I already tested numerous solutions but none of them worked.

The database actually exists

You can download source project Here.

CodePudding user response：

The name of database is wrong. Check whether it is another name or case.

CodePudding user response：

So I tried to fix the error myself but there is another one

 Authentication to host 'localhost' for user 'root' using method 'caching_sha2_password' failed with message: Unknown database 'mysql80'