How to create database connection in vb.net

Imports System.Data.OleDb

Public Class Form1
Dim connectionString As String
Dim cnn As OleDbConnection

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

cnn = New OleDbConnection(connectionString)
Try
cnn.Open()
MsgBox("Connection open")
cnn.Close()

Catch ex As Exception
MsgBox("connection is no open")

End Try

End Sub
End Class
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