Необработанное исключение типа "system.data.oledb.oledbexception" произошло в system.data.dll дополнительная информация: синтаксическая ошибка в инструкции INSERT into..

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An unhandled exception of type 'System.Data.OleDb.OleDbException' occurred in System.Data.dll
Additional information: Syntax error in INSERT INTO statement..

Эта ошибка отображается при попытке сохранить запись только в первой таблице данные сохраняются успешно но во второй таблице данные не сохраняются и показывают ошибку
поэтому, пожалуйста, помогите мне решить эту проблему.
мой код здесь:
сначала у меня есть две таблицы в моей базе данных CUSTOMER и второе MONTHLYINSTALLMENT

Что я уже пробовал:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.OleDb;
using System.Configuration;


namespace Fincorp
{
    public partial class NewCustomerEntry : Form
    {
        public NewCustomerEntry()
        {
            InitializeComponent();
        }

        private void NewCustomerEntry_Load(object sender, EventArgs e)
        {
           
        }

        private void textBoxMobileNo_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBoxNetLoanAmt_TextChanged(object sender, EventArgs e)
        {

        }

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

        private void btnsaveCustomerEntry_Click(object sender, EventArgs e)
        {
            if (IsValidated())
            {
                try
                {
                    SaveRecord(); tabControl1.SelectTab(tabPage2); SaveRecord1();
                    
                }
                catch (ApplicationException ex)
                {
                    MessageBox.Show("Error:" + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }
        }

        private void SaveRecord()
        {
            String connstring = ConfigurationManager.ConnectionStrings["vijay"].ConnectionString;
            string cmdstring = "insert into customer (LoanNumber, LoanDate, CustomerName, FatherName, Address, MobileNo, SecMobileNo, City, District, State) VALUES (@LoanNumber, @LoanDate, @CustomerName, @FatherName, @Address, @MobileNo, @SecMobileNo, @City, @District, @State)";
          
            using (OleDbConnection con = new OleDbConnection(connstring))
            {
                using (OleDbCommand cmd = new OleDbCommand(cmdstring, con))
                {
                    con.Open();

                    cmd.Parameters.AddWithValue("@LoanNumber", textBoxLoanNumber.Text);
                    cmd.Parameters.AddWithValue("@LoanDate", textBoxLoanDate.Text);
                    cmd.Parameters.AddWithValue("@CustomerName", txtCustomerName.Text);
                    cmd.Parameters.AddWithValue("@FatherName", txtFatherName.Text);
                    cmd.Parameters.AddWithValue("@Address", txtAddress.Text);
                    cmd.Parameters.AddWithValue("@MobileNo", txtMobileNo.Text);
                    cmd.Parameters.AddWithValue("@SecMobileNo", txtSecMobileno.Text);
                    cmd.Parameters.AddWithValue("@City", txtCity.Text);
                    cmd.Parameters.AddWithValue("@District", txtDistrict.Text);
                    cmd.Parameters.AddWithValue("@State", txtState.Text);
                    
                    cmd.ExecuteNonQuery();
                    MessageBox.Show("Recourd is saved", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    con.Close();
                }   
            }
        }

        private void SaveRecord1()
        {
            tabControl1.SelectTab(tabPage2);
            {
                String connstring = ConfigurationManager.ConnectionStrings["vijay"].ConnectionString;
                string cmdstring = "insert into monthlyinstalment (LoanNumber, Price, DownPayment, FileCharge, Month, Intrest) VALUE (@LoanNumber1, @Price, @DownPayment, @FileCharge, @Month, @Intrest)";

                using (OleDbConnection con = new OleDbConnection(connstring))
                {
                    using (OleDbCommand cmd = new OleDbCommand(cmdstring, con))
                    {
                        con.Open();

                        cmd.Parameters.AddWithValue("@LoanNumber1", textBoxLoanNumber.Text);
                        cmd.Parameters.AddWithValue("@Price", txtPrice.Text);
                        cmd.Parameters.AddWithValue("@DownPayment", txtDownPayment.Text);
                        cmd.Parameters.AddWithValue("@FileCharge", txtFileCharge.Text);
                        cmd.Parameters.AddWithValue("@Month", txtMonth.Text);
                        cmd.Parameters.AddWithValue("@Intrest", txtInterest.Text);

                        cmd.ExecuteNonQuery();
                        con.Close();
                    }
                }
            }
        }

        private bool IsValidated()
        {
           if (txtCustomerName.Text.Trim() == string.Empty)
           {
               MessageBox.Show("Customer Name is Requied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
               txtCustomerName.Focus();
               return false;
           }

           if (txtFatherName.Text.Trim() == string.Empty)
           {
               MessageBox.Show("Father's Name is Requied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
               txtFatherName.Focus();
               return false;
           }

           if (txtAddress.Text.Trim() == string.Empty)
           {
               MessageBox.Show("Address is Requied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
               txtAddress.Focus();
               return false;
           }

           if (txtMobileNo.Text.Trim() == string.Empty)
           {
               MessageBox.Show("Mobile Number is Requied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
               txtMobileNo.Focus();
               return false;
           }


           if (txtPrice.Text.Trim() == string.Empty)
           {
               MessageBox.Show("Loan Amount is Requied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
               tabControl1.SelectTab(tabPage2);  txtPrice.Focus();
               return false;
           }

           if (txtDownPayment.Text.Trim() == string.Empty)
           {
               MessageBox.Show("Down Payment is Requied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
               tabControl1.SelectTab(tabPage2);  txtDownPayment.Focus();
               return false;
           }

           if (txtFileCharge.Text.Trim() == string.Empty)
           {
               MessageBox.Show("File Charge is Requied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
               tabControl1.SelectTab(tabPage2);  txtFileCharge.Focus();
               return false;
           }
           if (txtMonth.Text.Trim() == string.Empty)
           {
               MessageBox.Show("Month is Requied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
               tabControl1.SelectTab(tabPage2);  txtMonth.Focus();
               return false;
           }

           if (txtInterest.Text.Trim() == string.Empty)
           {
               MessageBox.Show("Interest Rate is Requied", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
               tabControl1.SelectTab(tabPage2); txtInterest.Focus();
               return false;
           }
            
            return true;
        }
    }
}

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