int newID = 0;
using (var con1 = new SqlConnection(conString1))
using (var con2 = new SqlConnection(conString2))
{
    con1.Open();
    con2.Open();
    using (var selectCommand = new SqlCommand(sqlSelect, con1))
    {
        using (var reader = selectCommand.ExecuteReader())
        {
            try
            {
                if (reader != null)
                    if (reader.Read())
                    {
                        using (var insertCommand = new SqlCommand(sqlInsert, conTarget))
                        {
                            for (int i = 0; i < reader.FieldCount; i++)
                            {
                                insertCommand.Parameters.AddWithValue(
                                    "@" + reader.GetName(i), reader[i]);
                            }
                            newID = (int)insertCommand.ExecuteScalar();
                        }
                    }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                reader.Close();
            }
        }
    }
}

using (var con1 = new SqlConnection(ConString1))
{
    con1.Open();
    var cmd = new SqlCommand(query , con1);
    var reader = cmd.ExecuteReader();

    using (var con2 = new SqlConnection(conString2))
    {
        con2.Open();

        using (var sbc = new SqlBulkCopy(conString2))
        {
            sbc.BulkCopyTimeout = 2000;
            sbc.DestinationTableName = "student";
            try
            {
                if (reader != null)
                    sbc.WriteToServer(reader);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                reader.Close();
            }
        }
    }
}