insert in two table with check condition

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C#5.0

hi i have a project and need help.anybody knows what must i do?
i have a page that give a patentid to any patient for giving service that is unique.every patient has some service and some paper.i have 2 table paper and givservice in sql.i want enter services that have the same patientid on giveservice table how must i do that?
here is my code:

private void insert_Click(object sender, EventArgs e)

        {


            SqlConnection con = new SqlConnection();
            con.ConnectionString = "server=.;database=database;integrated security=true;";
            SqlCommand com1 = new SqlCommand();
            SqlCommand com2 = new SqlCommand();
            SqlCommand com3 = new SqlCommand();
            SqlCommand com4 = new SqlCommand();
            SqlCommand com5=new SqlCommand();
            com1.CommandText="DECLARE @papercode smallint";
            com2.CommandText = " insert into paper(date,drcode,patientid,unitid,personid)values(@date,@drcode,@patientid,@unitid,'15')";
            com5.CommandText = "SET @papercode=SCOPE_IDENTITY()";
            com3.CommandText = " Select @papercode=papercode From patient,Paper Where patient.patientid=Paper.patientid";
            com4.CommandText = "insert into givservice (papercode,price,tedad,khid) values ( @papercode,@price,@tedad,@khid)";
            com1.Connection = con;
            com2.Connection = con;
            com3.Connection = con;
             com4.Connection = con;
            com1.Parameters.AddWithValue("@date", txtdate.Text);
            com1.Parameters.AddWithValue("@patientid",txtpaziresh.Text);
             com1.Parameters.AddWithValue("@unitid",cmdunitname.SelectedValue);
             com1.Parameters.AddWithValue("@drcode", cmddrname.SelectedValue);
            com4.Parameters.AddWithValue("@tedad", txttedad.Text);
            com4.Parameters.AddWithValue("@price", cmdprice.SelectedValue);
            com4.Parameters.AddWithValue("@khid", cmdkh.SelectedValue);
            SqlParameter idOut = com5.Parameters.Add("@papercode", SqlDbType.SmallInt);
            idOut.Direction = ParameterDirection.Output;
            con.Open();
            com1.ExecuteNonQuery();
            SqlDataReader dr= com3.ExecuteReader();                  
            con.Close();
}