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The database cannot be opened because it is version 839. This server supports version 782 and earlier. A downgrade path is not supported

I made a C# project that contains a local database (Microsoft SQL Database Server) (mdf) in my pc that works totally fine. but whenever i use my laptop to run it, it gives me this error:
The database 'C:(the path)\CALENDER.MDF' cannot be opened because it is version 839. This server supports version 782 and earlier. A downgrade path is not supported.
this error appears every time i try to refresh server explorer. i need it to work in my laptop because i use it to make a class presentation.

After a long researches and tries i figured how to solve this issue. its a bit complicated. i converted the mdf database to and access(mdb) and import data from the mdb to a new mdf database.
these are the steps:
Create an empty access (mdb) database.
using SQL Server 2016 CTP3.0 Import and Export Data: import data from database which is calander.mdf in my case to the new access database (mdb).
now in the destination pc, create a new vs form and add a new empty mdf database.
using Microsoft SQL Server Management Studio ( Databases > right click new database > type database name and click OK.)
Right mouse click on your database name and hover to Tasks and then select the Import Data.
select the data source Microsoft Access (Microsoft Access Database Engine) and browse to the access database and click next.
in Destination select Net Framework Data Provider For SqlServer and type the connection string for the new empty created mdf database. then click next and finish.
Copy the new mdf database To your project file
now you got the new database filled with data and all is left is go to your main project and delete the database and then add new existing item and browse to the new database and log file and clock ok. and the database should work
WORKED WITH ME !!!!!!

C# Project - InstallShield , MySql error when run after installation

I have a project in C# which is created in Visual Studio 2013. I want to create an installer using Install Shield free version. I created an installer and trying to run it on other computer but, when I run it and trying to log into program, I have problems about mysql database. Error message is:
Unhandled exception has occured in you application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.
Cannot connect.
If I click on details button, I have a serie of errors which refers on Mysql. Example:
System.Exception: Cannot connect ---> MySql.Data.MySqlClient.MySqlException: Unable to connect to any of the specified MySQL hosts.
at MySql.Data.MySqlClient.NativeDriver.Open()
at MySql.Data.MySqlClient.Driver.Open()
at MySql.Data.MySqlClient.Driver.Create(MySqlConnectionStringBuilder settings)
at MySql.Data.MySqlClient.MySqlPool.GetPooledConnection()
at MySql.Data.MySqlClient.MySqlPool.TryToGetDriver()
at MySql.Data.MySqlClient.MySqlPool.GetConnection()
at MySql.Data.MySqlClient.MySqlConnection.Open()
at simulator.ConnConfig.getConnection()
simulator is the name of the project. ConnConfig is a class where is the connection and getConnection() is a function from ConnConfig which return connection. II tried to install on another computer .NET Framework 4.5.2, SQL Server, but also didn't worked.
In my project, I use localhost server where I have a database with 2 tables. My question is, is there any possibility to add that localhost database to installer and use it on another computer? And what redistributables requires this operation? Also, I have installed on computer .NET Framework 4.5, Sql Server 2012..but when I try do add them in InstallShield via Redistributables, but it keeps saying that Needs to be downloaded. Why?
UPDATE
I have this Class where I make the conenction. But I receive error: Additional information: Illegal characters in path. at that line:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SQLite;
namespace simulator
{
class ConnConfig
{
private static string conn = "Data Source=c:\aplicatie.db;Version=3;Password=myPassword;";
public static SQLiteConnection connect = null;
private ConnConfig()
{
}
public static SQLiteConnection getConnection()
{
SQLiteConnection connect = null;
try
{
connect = new SQLiteConnection(conn);
connect.Open();// here I receive the error
return connect;
}
catch (SQLiteException e)
{
throw new Exception("Cannot connect", e);
}
}
}
}
UPDATE 3
In that class I make the connection to database. In the other forms I just use tables and their data. For connection to program, I use a login form which uses this class to getConnection(). I created that database by adding an ADO.NET in simulator project. And with that, it comes those 2 tables that I already have in localhost server. So, Is ok if I have to create another empty database with new tables, but where to include that code or how to use it, because I don't get how that script works..where should I put it?

If your database is going to be installed on each client and your tables are not massive you might want to look at something lighter like SQLite which doesn't need any installation just the dlls and is very fast and efficient and only runs when your program does.
As for for the Needs to be Downloaded issue, it seems you have not setup your prerequisite correctly, you an correct this by following the steps in this article
Adding InstallShield Prerequisites, Merge Modules, and Objects to Basic MSI and InstallScript MSI Projects
You might want to look into determining if MySQL is the right solution for you.
SQLite vs MySQL vs PostgreSQL: A Comparison Of Relational Database Management Systems
And to see the limitations of SQLite SQLite
Because honestly seems like overkill to install MySQL on every system. If you had one server with MySQL on the network, okay. But on every system seems like a bad idea.
As far as connecting to an SQLite database here is a List of Connection Strings for SQLite
See this topic on how to create Databases and tables Create SQLite Database and table

My guess is your program doesn't bundle up the database alongside the setup upon deployment. This may be due to the fact that you didn't mark your database as a Data File in the Project Files. Try this, right click on your project name in Solution Explorer and select Properties from Menu. From the horizontal tabs click on the Publish Tab. Under Install Mode and Settings click the Application Files button. A dialog box appears with all Application files. Set your database Publish Status to Data File from the drop down on the corresponding cell. This way your database will be bundled together with the setup upon publishing. Hope this helps.

You can access SQLite via ODBC.

Change SSRS data source of report programmatically in server side

Today, for each customer, we deploy same SSRS reports folder and data source folder.
The difference between these folders are the name of each folder and the connection string of the data source.
We are using Report Server 2008 R2.
Is it possible to maintain only one reports and data source folder and change programmatically its connection string on server-side before the report been rendered?
If not, Is it something that can be achieved by changing some logic in reports?
Today we use "shared data source" option.

This is something we've done in our environment - we maintain one set of reports that can be deployed at any client with their own configuration.
You've got a couple of options here. Since you're using a Shared Data Source this makes things easier as you won't need to define a Data Source for each report.
1. Use the rs.exe utility and a script file
rs.exe at Books Online
This program allows you to create script files (in VB.NET) that can interact with a Report Server Web Service. You create a script file (e.g. Deploy.rss) and call the rs.exe program with various parameters, including any custom ones you define:
rs.exe -i DeployReports.rss -s http://server/ReportServer -v DatabaseInstance="SQL" -v DatabaseName="ReportDB" -v ReportFolder="ClientReports"
So this would call a script DeployReports.rss, connect to http://server/ReportServer, with three user defined parameters which could be used to create a data source and the report folder.
In the scipt file you could have something like this:
Public Sub Main()
rs.Credentials = System.Net.CredentialCache.DefaultCredentials
CreateFolder(reportFolder, "Report folder")
CreateFolder(datasourceFolder, "Data source folder")
CreateDataSource()
End Sub
Which can then make Web Service calls like:
rs.CreateFolder(folderName, "/", Nothing)
'Define the data source definition.
Dim definition As New DataSourceDefinition()
definition.CredentialRetrieval = CredentialRetrievalEnum.Integrated
definition.ConnectString = "data source=" + DatabaseInstance + ";initial catalog=" + DatabaseName
definition.Enabled = True
definition.EnabledSpecified = True
definition.Extension = "SQL"
definition.ImpersonateUser = False
definition.ImpersonateUserSpecified = True
'Use the default prompt string.
definition.Prompt = Nothing
definition.WindowsCredentials = False
Try
rs.CreateDataSource(datasource, datasourcePath, False, definition, Nothing)
Console.WriteLine("Data source {0} created successfully", datasource)
Catch e As Exception
Console.WriteLine(e.Message)
End Try
You haven't specified what version of Reporting Services you're using, so I'm assuming 2008. Please note that there are multiple endpoints that can be used, depending on SQL Server version. The 2005/2008 end point is deprecated in 2008R2 and above but is still usable. Just something to bear in mind when writing your script.
2. Call the SSRS Web Service through an application
Report Server Web Service overview
The same calls that are made from the script above can be made in any other application, too. So you'd just need to add a reference to a Report Server Web Service through WSDL and you can connect to a remote service and call its methods to deploy reports, data sources, etc.
So ultimately you're connecting to the Report Server Web Service, it's just the medium used that you need to think about.
Using a script is easier to get running as it's just running a program from the command line, but writing your own deployment application will certainly give greater flexibility. I would recommend getting the script going, so you understand the process, then migrate this to a bespoke application if required. Good luck!

You can use an Expression Based Connection String to select the correct database. You can base this on a parameter your application passes in, or the UserId global variable. I do believe you need to configure the unattended execution account for this to work.
Note: be careful about the security implications. Realize that if you would pass sensitive data (e.g. passwords) into a parameter, that (a) it will go over the wire, and (b) will be stored in the execution log tables for reporting services.

C# windows application set up on different machines and all work on one SQL Server 2008 database

I have created a desktop application with SQL Server 2008 as backend. I want to use this database from my application that is installed on a number of machines.
What are the requirements for that application to connect to the centralized database.?

It is pretty simple, You want the architecture as Client-Server model were the server has the database .Hence you need to have MS SQLserver 2005 or higher versions and create database connect it to sqlserver. Grant permission for the clients to access the database.
From visual studio side:
Add the above created .mdf(database file) as the new data source.
Data-->Add new Data Source , and follow the steps in the wizard[p.s the type of connection has to be sql sever type ]
while doing this a connection string will be created by VS. Use tht connection string to access from the client side.
This link would be useful : http://msdn.microsoft.com/en-us/library/sxds9ett(v=vs.80).aspx

To keep the connection string in its resources, ofcourse.
Resources are:
Doubleclick on project's Properties (at solution explorer).
Then Settings tab.
If there is no default setting file, create it by clicking the long link label.
Add a setting like "ConnectionString" with the value like "Data Source = ..." whatever.
Then you can run your sql scripts like:
SqlConnection conn =
new SqlConnection(Properties.Settings.Default.ConnectionString);
And go on.

Creating a database when installing an SAP Business 1 Add on

I am creating an SAP Business one add-on payroll application - EIMPayroll. I have created an .ard file and I am able to install this add-on in SAP, ie, going to the add on manager and registering the payroll application using the .exe and .ard files.
However, on the machine that I install this add-on on, I have to manually import/create the Microsoft SQL server database "Eim_payroll.bak" on the computer for this add-on to run.
My question is, is there a way I can write the sql query to create the database and tables needed to run this application on a C# file and then package it together into the ard file such that it installs when I install the add-on in SAP?
I create the ard file using Visual Studio 2010 and using the SAP B1 AddOnInstaller .NET Wizard. My add-on is in C#
Any help will be appreciated, including links on examples of how this is done.

Not sure what exactly you are asking. I believe you want to create user tables and user defined fields when registering the add-on in SAP.
Try this, it may work. For creating tables:
ousertable = ocompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oUserTables)
ousertable.TableName = "OEMP"
ousertable.TableDescription = "Employee Header"
lretcode = ousertable.Add
If lretcode 0 Then
ocompany.GetLastError(lerrcode, serrmsg)
sbo_application.MessageBox(serrmsg)
End If
For creating table fields:
ouserfield = ocompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oUserFields)
ouserfield.TableName = "#OEMP"
ouserfield.Name = "empid"
ouserfield.EditSize = "5"
ouserfield.Type = SAPbobsCOM.BoFieldTypes.db_Numeric
ouserfield.Description = "Employee id"
lretcode = ouserfield.Add
If lretcode 0 Then
ocompany.GetLastError(lerrcode, serrmsg)
sbo_application.MessageBox(serrmsg)
End If
Cheers