Why Am I Getting a \'No MySQL Host\' Error with My C# Connection String?

Troubleshooting MySQL Connection Strings

When attempting to establish a connection to a MySQL database using C#, users can encounter errors such as "there is no MySQL host with these parameters." This issue stems from an improperly formatted connection string.

The provided connection string contains a potential error. Instead of using "SERVER" as the property name, use "Server" as shown in the optimized code below:

string MyConString = "Server=mysql7.000webhost.com;" +
            "Database=a455555_test;" +
            "Uid=a455555_me;" +
            "Password=something;";

MySqlConnection connection = new MySqlConnection(MyConString);

Furthermore, it is recommended to use a MySqlConnectionStringBuilder to create the connection string. This allows for a more robust and flexible approach:

MySqlConnectionStringBuilder conn_string = new MySqlConnectionStringBuilder();
conn_string.Server = "mysql7.000webhost.com";
conn_string.UserID = "a455555_test";
conn_string.Password = "a455555_me";
conn_string.Database = "xxxxxxxx";

using (MySqlConnection conn = new MySqlConnection(conn_string.ToString()))
using (MySqlCommand cmd = conn.CreateCommand())
{
    //watch out for this SQL injection vulnerability below
    cmd.CommandText = string.Format("INSERT Test (lat, long) VALUES ({0},{1})",
                                   OSGconv.deciLat, OSGconv.deciLon);
    conn.Open();
    cmd.ExecuteNonQuery();
}

By utilizing the MySqlConnectionStringBuilder and correcting the property name in the connection string, users should be able to successfully connect to the MySQL database.

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