How to verify that you are connected to a MySQL database in C#?

Question

I added the reference for the MySQL server in C#. I thought I have this code right. I know the connection values are right for testing. Here is my error:

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Answer 1

Visit the MySQL download page entitled Download Connector/Net and proceed with the obvious. Note seek out the most recent download as this will age.

Use the appropriate MySQL classes.

using MySql.Data.MySqlClient;

string connString = @"server=localhost;userid=drew;password=OpenSesame;database=stackoverflow";

.

        long lRet = 0;
        using (MySqlConnection lconn = new MySqlConnection(connString))
        {
            lconn.Open();
            using (MySqlCommand cmd = new MySqlCommand())
            {
                cmd.Connection = lconn;
                cmd.CommandText = @"select count(*) as theCount from batchQMetricsToUpdate where status=1";
                lRet = (long)cmd.ExecuteScalar();
            }
        }
        return(lRet);

Add References screenshot:

Answer 2

You can do:

using(SqlConnection connection = new MySqlConnection(connectionString))
{
    try
    {
        conn.Open();
    }
    catch(SqlException ex)
    {
        switch(ex.Number) 
        { 
            case 18456: // Can't login
                // Do something
                break;
            default:
                break;
        } 
    }
}

To get the complete list of codes run:

SELECT * FROM master.dbo.sysmessages