Hey guys, what am i missing here:

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Using sqlConn As New SqlClient.SqlConnection(sqlConnString)
            sqlConn.Open()

            sqlConn.Close()
        End Using
    End Sub

    Public Property ServerName() As String = "myip"
    Public Property DatabaseName() As String = "mytable"
    Public Property Login() As String = "sa"
    Public Property Password() As String = "mypw"

    Public Function SqlConn(Optional timeout As Integer = 0) As String
        ' Initialize the connection string builder for the 
        ' underlying provider. 
        Dim sqlBuilder As New SqlClient.SqlConnectionStringBuilder()

        ' Set the properties for the data source. 
        sqlBuilder.DataSource = _serverName
        sqlBuilder.InitialCatalog = _databaseName
        sqlBuilder.IntegratedSecurity = False
        sqlBuilder.MultipleActiveResultSets = True 'to avoid exception if a query uses anothe rquery internal

        sqlBuilder.UserID = _Login
        sqlBuilder.Password = _Password
        If timeout > 0 Then
            sqlBuilder.ConnectTimeout = timeout
        End If

        Return sqlBuilder.ToString
    End Function

What's the problem exactly?

Error on Using sqlConn As New SqlClient.SqlConnection(sqlConnString) sqlConnString.

Please post you "sqlConnString" declaration code.

Its in sqlconn as you can see sqlbuilder :)

No it's not, that's what you are missing you need to declare the connection string

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