插入数据库时​​出现数据匹配错误

Question

我正在尝试将这些值插入ms数据库，但出现数据不匹配错误

这是代码

    If DbConnect() Then
        Dim SQLCmd As New OleDbCommand

        Dim dateafterconversion As String = datcurrentdate.Value.ToString("MM/dd/yyyy")
        Dim dateafterconversion2 As String = datDuedate.Value.ToString("MM/dd/yyyy")




        If CurrentRentalID = -1 Then
            With SQLCmd
                .Connection = cn
                .CommandText = "Insert into Tbl_Rental(CustomerID, StaffID, DateOfHire, DateOfReturn, Noofdays, Customer_firstname, Customer_lastname)"
                .CommandText &= " Values (@CustomerID, @StaffID, @DateOfHire, @DateOfReturn, @Noofdays, @Customer_firstname, @Customer_lastname)"
                .Parameters.AddWithValue("@CustomerID", txt_Customerid_Rental.Text)
                .Parameters.AddWithValue("@StaffID", txtStaffID.Text)
                .Parameters.AddWithValue("@DateOfHire", dateafterconversion)
                .Parameters.AddWithValue("@DateOfReturn", dateafterconversion2)
                .Parameters.AddWithValue("@Customer_firstname", txtfirstname_rental.Text)
                .Parameters.AddWithValue("@Customer_lastname", txtlastname_rental.Text)





                .Parameters.AddWithValue("@Noofdays", days)


                .ExecuteNonQuery()

                .CommandText = "Select @@Identity"
                CurrentRentalID = .ExecuteScalar
                txtOrderID.Text = CurrentRentalID

我认为问题出在Customer_firstname和Customer_lastname的位置上。我已经在数据库中检查了它们的拼写，并且它们匹配，所以我不太清楚问题出在哪里

任何帮助将不胜感激 谢谢