Inserting data into multiple SQL tables

Hello,

Here's the code that I've written which inserts data into the "maintable" and gets the auto-generated ID code from SQL Databse:

string rightID;

    protected void Wizard1_FinishButtonClick(object sender, WizardNavigationEventArgs e)
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["connectionstring"].ConnectionString);
        SqlCommand cmd2 = new SqlCommand("INSERT INTO maintable (Field1,Field2,Field3,Field4) VALUES (@field1,@field2,@field3,@field4); SELECT SCOPE_IDENTITY(); ", con);
        cmd2.CommandType = CommandType.Text;
        cmd2.Parameters.AddWithValue("@field1", TextBox21.Text);
        cmd2.Parameters.AddWithValue("@field2", TextBox22.Text);
        cmd2.Parameters.AddWithValue("@field3", TextBox23.Text);
        cmd2.Parameters.AddWithValue("@field4", TextBox24.Text);

        con.Open();
        rightID = cmd2.ExecuteScalar().ToString();
        cmd2.Connection.Close();
        hiddenFieldForRight.Text = rightID;

The code works find, what I now need is to insert a different set of data into another table called "secondtable" and use the "rightID" from the "maintable" as as a foreign key. SQL tables - set up & linked. Here's the code which goes below the main one:

SqlCommand cmd3 = new SqlCommand("INSERT INTO secondtable (fieldone,rightid) VALUES (@fieldone,@rightid)", con);
            cmd3.CommandType = CommandType.Text;
            cmd3.Parameters.AddWithValue("@fieldone", TextBox68.Text);
            cmd3.Parameters.AddWithValue("@propertyid", hiddenFieldForRight.Text);
            con.Open();
            cmd3.ExecuteNonQuery();
            cmd3.Connection.Close();

When the button is pressed everything goes through, but everything is duplicated - so I get 2 records in maintable and 2 records in secondtable.