Imports System.Data.SqlClient
Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim connetionString As String
        Dim cnn As SqlConnection
        connetionString = "Data Source=ServerName;Initial Catalog=DatabaseName;User ID=UserName;Password=Password"
        cnn = New SqlConnection(connetionString)
        Try
            cnn.Open()
            MsgBox("Connection Open ! ")
            cnn.Close()
        Catch ex As Exception
            MsgBox("Can not open connection ! ")
        End Try
    End Sub
End Class