how to connection MS access database in silverlightapplicatipon?

just follow these steps.
1.create a silverlight application.
2.right click the web project and add new item and add the "Silverlight-enabled Wcf service".
3.in the wcf service add the method u want to access the databases.
4.its the same way how u do in your code behind.in Silverlight u cant reach database directly.u can reach database only through services.
5.add a service referrence to ur silverlight project.right click the refrence and click "Add service references" and select the wcf service that u created and give a name for it.
6.now go to your codebehind or where u want to access the database.
7.create a client for the service that u referred.
then using the client u will be getting a ASYNCHRONOUS method for each method u created in wcf service.

for ex:- if u created a method "GetEmployees" in WCF service,in ur code behind using service client u will get a name called GetEmployeesAsync through which can access the method in WCF service and data base will be accessed from service.

8.The same way u have to do with using oldb namespace..the rest are same as usual..

FOR FURTHER CLEAR APPROACH WITH SCREENSHOTS VISIT THIS BLOG:
http://swayingtheworld.blogspot.com/2011/08/accessing-databases-in-silverlight.html

look dear its possible and its very very easy too...
for accessing MS ACCESS u need to add this namespace "system.data.oledb".
but this namespace wont be available in ur silverlight application.THIS NAMESPACE WILL BE AVAILABLE ONLY IN THE WEB PROJECT,i.e WCF SERVICE THAT U R USING...

i will write a sample code here..but just follow the logic of it!
this is in the wcf service..ok?
right click the web project and add new item called "Silverlight-Enabled Wcf service" and name it as SampleService. and some thing like this that follows...

using system;
using System.Data.SqlClient;
using System.Data;

namespace TimeManagement.Web
{
[DataContract]
public class Employee
{
[DataMember(Order = 0)]
public string EmployeeID { get; set; }
[DataMember(Order = 1)]
public string FirstName { get; set; }
[DataMember(Order = 2)]
public string LastName { get; set; }
[DataMember(Order = 3)]
public string EmailAddress { get; set; }
}
[ServiceContract(Namespace = "")]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class SampleService
{
[OperationContract]
public int InsertEmployee(string Firstname, string Lastname, string EmployeeId,string Email)
{
//do ur string connections
//and insert the datas to ur msaccess tables.
//its nearly the same how u use to connect with sql.
//since its returning integer use executenonquery to return ur values.
}
}

now in ur silverlight application..in reference right click and add new service reference and name it sampleserviceRef...
now go to the page where u want to insert ur datas to access database and do the following...

public void InsertEmployee(string Firstname, string Lastname, string EmployeeId, string Email)
{
//creating client for the service
var SerObj = new SampleServiceRef.TMServiceClient();
SerObj.InsertEmployeeAsync(Firstname, Lastname, EmployeeId,Email);
}

thats it values are inserted...
u cant directly communicate to database in silverlight because silverlight is a clientside application..u can communicate to database only through WCF service!!!
if u still cant understand,tell me ur queries..let me explain u!!!