How to pass data from one form to another?

I'm building a C# application which has to retreive a table data from my local database & display it on the form1, the form1 contains a separate button for Email function when i click on the Email button a new form form2 is opening through which a email can be sent & it contains To,cc,subject & message body, i want the retrieved data from database to be displayed in message body & the same data to be sent to the mail ids when i click on send button.

Currently I'm able to retrieve a data in form1 & from form2 i'm able to send a email successfully.

Can someone tell me how can i bring the data on form1 to form2 directly to message body of the Email

Form1 code

    private void exitBtn_Click(object sender, EventArgs e)
    {
        this.Close();
    }


    private void exitBtn_MouseClick(object sender, MouseEventArgs e)
    {
        this.Close();
    }
    private void submitBtn_MouseClick(object sender, EventArgs e)
    {
        try
        {
            String str = "server=localhost;port=3306;database=demo;UID=root;password=admin1234";
            String query = "select * from demo.cstdetails;";
            MySqlConnection con = new MySqlConnection(str);
            MySqlCommand cmd = new MySqlCommand(query);
            con.Open();
            MySqlDataAdapter sda = new MySqlDataAdapter(query, str);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            dataGridView1.DataSource = ds.Tables[0].DefaultView;
            //MessageBox.Show("connect with sql server");
            con.Close();
        }
        catch (Exception es)
        {
            MessageBox.Show(es.Message);

        }
    }

    public void sql_conn()
    {
        throw new NotImplementedException();
    }

    private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {

    }

    private void dataGridView1_CellContentClick_1(object sender, DataGridViewCellEventArgs e)
    {

    }

    private void emailBtn_Click(object sender, System.EventArgs e)
    {
        email frm = new email();
        frm.Show();
    }

}

Form2 Code

    private void sndBtn_Click(object sender, EventArgs e)
    {
       // MessageBox.Show("This is sendbutton");
        try
        {
            SmtpClient server = new SmtpClient("smtp.gmail.com");
            server.Port = 587;
            server.EnableSsl = true;
            server.Timeout = 100000;
            server.DeliveryMethod = SmtpDeliveryMethod.Network;
            server.UseDefaultCredentials = false;
            server.Credentials = new NetworkCredential("user", "password");
            MailMessage msg = new MailMessage();
            msg.To.Add(textBox_To.Text);
            msg.From = new MailAddress("mytest@gmail.com");
            msg.Subject = textBox_Subject.Text;
            msg.Body = dataGridView1.DataSource = ds.Tables[0].DefaultView;
            try
        {
            String str = "server=localhost;port=3306;database=demo;UID=root;password=admin1234";
            String query = "select * from demo.cstdetails;";
            MySqlConnection con = new MySqlConnection(str);
            MySqlCommand cmd = new MySqlCommand(query);
            con.Open();
            MySqlDataAdapter sda = new MySqlDataAdapter(query, str);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            //MessageBox.Show("connect with sql server");
            con.Close();
        }
        catch (Exception es)
        {
            MessageBox.Show(es.Message);

        }
            //Attachment data = new Attachment(textBox_Attachment.Text);
           // msg.Attachments.Add(data);
            server.Send(msg);
            MessageBox.Show("Successfully Sent Message.");
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
    private void dscrdBtn_Click(object sender, EventArgs e)
    {
        this.Close();
    }
    private void dscrdBtn_MouseClick(object sender, MouseEventArgs e)
    {
        this.Close();
    }

    private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {

    }
}