В чем ошибка?

SqlCommand insertRequestInfoCMD = new SqlCommand("INSERT INTO [Requests] (client_id) VALUES (@client_id) FROM [Auto] WHERE [state_number]='" + comboBox1.Text + "';", MyConnection);
                    insertRequestInfoCMD.Parameters.AddWithValue("@client_id", client_id);
                    insertRequestInfoCMD.Parameters.AddWithValue("@start_date", thisDay.ToString());
                    insertRequestInfoCMD.Parameters.AddWithValue("@status", status);

SqlCommand insertProblemInfoCMD = new SqlCommand("INSERT INTO [client_problems] FROM [Problems] (client_id, problem_id) VALUES (@client_id, @problem_id) ", MyConnection);
                    insertProblemInfoCMD.Parameters.AddWithValue("@client_id", client_id);
                    insertProblemInfoCMD.Parameters.AddWithValue("@problem_id", comboBox2.SelectedValue);

 SqlCommand getID = new SqlCommand("Select [client_id] from Auto where [state_number]='" + comboBox1.Text + "'", MyConnection);
                    SqlCommand insertRequestInfoCMD = new SqlCommand("INSERT INTO [Requests] (client_id, start_date, status) VALUES (@client_id, @start_date, @status)", MyConnection);
                    insertRequestInfoCMD.Parameters.AddWithValue("@client_id", client_id);
                    insertRequestInfoCMD.Parameters.AddWithValue("@start_date", thisDay.ToString("g"));
                    insertRequestInfoCMD.Parameters.AddWithValue("@status", status);
                    SqlDataReader dataReader = getID.ExecuteReader();
                    dataReader.Read();
                    client_id = Convert.ToInt16(dataReader.GetValue(0));
                    return client_id;

SqlDataReader dataReader = insertRequestInfoCMD.ExecuteReader();
dataReader.Read();
client_id = (Int16)getID.ExecuteScalar();
client_id = Convert.ToInt16(dataReader.GetValue(0));
return client_id;