What's wrong with this code???

[Memnoch1207]

The code below keeps generating the following error and I don't know why???

testDatabaseModules.cs(28,6): error CS0246: The type or namespace name 'myConnection' could not be found (are you missing a using directive or an assembly reference?)

using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;
 
class Database
{
    public static void db_open(string ConnectionStringPayload)
    {
        if(ConnectionStringPayload == "")
            MessageBox.Show("Connection Error.", "Invalid Connection String", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
        else
            try
            {
                SqlConnection myConnection = new SqlConnection(ConnectionStringPayload);
                myConnection.Open();
            }
            catch
            {
                MessageBox.Show("Connection Error", "Cannot connect to database, please check the connection string.");
            }
    }
    
    public static string db_state()
    {
        string state = "";
        [color=red]if(myConnection.State.ToString() == "Open") ' errors here[/color]
            state = "Open";
        else
            state = "Closed";
            
        return state;   
            
    }
    
    public static void Main()
    {
        string myConnectionString = ("server=localhost;database=pubs;user id=xxx;password=xxx;");
        db_open(myConnectionString); 
        Console.WriteLine("Connection State: " + db_state());
    }
}