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Oledb access is ok when execution with IDE .... but this code is copy to paste in notepad file and save with .cs extension and compile with cmd ... this error detect..
using System;
using System.Data;
using System.Data.OleDb;
using System.Xml.Serialization;


namespace MSAccessTest
{
   
   

    public class MainClass
    {
        public static void Main()
        {
            
            string cnn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=D:\lovetest.accdb;Persist Security Info=False";
           
            Console.Write("Enter Your Name :");
            string accName = Console.ReadLine();
            Console.Write("Enter Your Love :");
            string accNumber = Console.ReadLine();
            Random percent = new Random();

            int per = percent.Next(20, 99);

            OleDbConnection conn = new OleDbConnection(cnn);
            OleDbCommand cmd = new OleDbCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "INSERT INTO love([ID],[YourName], [YourLover],[LovePercent]) Values('"+Guid.NewGuid()+"','" + accName + "','" + accNumber + "','" + per + "')";
            cmd.Connection = conn;
          
            conn.Open();
           

            cmd.ExecuteNonQuery();
            Console.WriteLine("Your score have {0} %",per);
            conn.Close();
}
}
}


What I have tried:

I want to know MS access can connect with my c# code file without IDE.
Posted 6-Dec-17 23:36pm
Updated 7-Dec-17 1:18am
v2

1 solution

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Solution 1

Simple: the ACE engine must be installed and registered on the machine.
If this is a different PC from that with Visual Studio installed, then install and register the appropriate version of ACE - if your app is built for 64 bit, you need 64 bit ACE, and if it's a 32 bit app, you need the 32 bit ACE engine registered.

If it's the same PC, then probably you are building it for the wrong target: 32 bit instead of 64 or vice versa. Check your IDE build properties to find out which version it builds for and include that in your command line parameters for your "manual" build.

But do yourself a favour, and don't do it like that! Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:
SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'
The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:
SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'
Which SQL sees as three separate commands:
SELECT * FROM MyTable WHERE StreetAddress = 'x';
A perfectly valid SELECT
DROP TABLE MyTable;
A perfectly valid "delete the table" command
--'
And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?
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