Parameterized UPDATE in SQLite and C# throwing an exception

I have been staring at this code too long. This block keeps throwing an exception which says :

{System.Data.SQLite.SQLiteException (0x80004005): SQL logic error or missing database
         near ",": syntax error

That sounds like it could be the forming of my SQL, but I don't see it.

I know the process of creating and filling the parameters is correct. It works in other places of the same application. The SQL looks good when I check it as a string, but I cannot check it just before it goes to the SQLite engine.

Research has confirmed my process, but I am missing something or a typo is just hiding from me. Can you please take a look and see if the error stands out to you? Is there a better way to go about this?

Code

public static int updatePartner( Partner updatedPartner, Partner oldPartner)
{
    int result = 0;
    SQLiteConnection connection = GroomwatchDB.GetConnection();

    string sqlStatement = "UPDATE partners SET [last_name] = @lastName, [first_name] = @firstName, " 
        + "[pay_rate] = @payRate, [active] = @uactive "
        + "WHERE [partner_code] = @oldPartnerCode, [last_name] = @oldLastName, [first_name] = @oldFirstName "
        + "[pay_rate] = @oldPayRate, [active] = @oldActive";

    MessageBox.Show(sqlStatement);

    SQLiteCommand command = new SQLiteCommand(sqlStatement, connection);
    command.Parameters.Add(new SQLiteParameter("@lastName"));
    command.Parameters.Add(new SQLiteParameter("@firstName"));
    command.Parameters.Add(new SQLiteParameter("@payRate"));
    command.Parameters.Add(new SQLiteParameter("@uactive"));
    command.Parameters.Add(new SQLiteParameter("@oldPartnerCode"));
    command.Parameters.Add(new SQLiteParameter("@oldLastName"));
    command.Parameters.Add(new SQLiteParameter("@oldFirstName"));
    command.Parameters.Add(new SQLiteParameter("@oldPayRate"));
    command.Parameters.Add(new SQLiteParameter("@oldActive"));
    command.Parameters["@lastName"].Value = updatedPartner.Last_name;
    command.Parameters["@firstName"].Value = updatedPartner.First_name;
    command.Parameters["@payRate"].Value = updatedPartner.Pay_rate;
    command.Parameters["@uactive"].Value = updatedPartner.Active;
    command.Parameters["@oldPartnerCode"].Value = oldPartner.Code;
    command.Parameters["@oldLastName"].Value = oldPartner.Last_name;
    command.Parameters["@oldFirstName"].Value = oldPartner.First_name;
    command.Parameters["@oldPayRate"].Value = oldPartner.Pay_rate;
    command.Parameters["@oldActive"].Value = oldPartner.Active;
    try
    {
        connection.Open();
        result = command.ExecuteNonQuery();              
    }
    catch (SQLiteException ex)
    {
        throw ex;
    }
    finally
    {
        connection.Close();
    }
    return result;

}