You don't need to surround the database path in quotes inside a connection string. The key/value pairs are all delimited. It should look like this instead.

thanks hamrick
I did that now I have this code :
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'seting the data connection
Dim sql As String
Dim con As New OleDb.OleDbConnection
Dim ds As New DataSet
Dim da As OleDb.OleDbDataAdapter
con.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0; Data Source=C:\Documents and Settings\shassanzadeh\Desktop\Sara\extra\AddressBook.mdp"
'setting the data Adaptor and Data set

con.Open()
Sql = "SELECT * FROM tblContacts"
da = New OleDb.OleDbDataAdapter(Sql, con)
MsgBox("connection open")
con.Close()
MsgBox("connection close")



End Sub

and no syntex error but while I compile it doesnt show any thing and after that I get this error"OleDbException was unhandled "and it poits to a yellow line on con.open()
well according to this link because I am using express edition , I should set my project refrences to System.Xml.dll but here there is no such thing it is only system.xml what do you think I should do?

System.Xml and System.Xml.dll are the same thing in the reference picker. But that reference should have been added when you made a windows forms project...

i changed that but still it gives errors on the line con.open()
I redo it again also I enclude at the top system.Xml but still it doesnt work.

What message does the exception give you?

it says it cant find this file while I double checked and the path is 100%correct

Put it somewhere else without all of the extra nesting, like C:\. Make sure that the extension is right. If this is access, it should be *.mdb, not *.mdp, I think. When it tells you it can't find the file, it can't find the file. That means the connection string is wrong somehow.

Read this article and you can even download a working sample which uses Connection to Access DB through ASP. Click here

thankx hamrick it is solved