[Solved] ASP.Net Web Method Error: Cannot refer to an instance member of a class from within a shared method

Hi Corobori,

Make sure that you set the SendEmailTo function as Shared.

Refer below sample code.

Namespaces

Imports System.Net
Imports System.Net.Mail
Imports System.Threading
Imports System.Web.Script.Services
Imports System.Web.Services

Code

<WebMethod(EnableSession:=True)>
<ScriptMethod()>
Public Shared Function SendData(ByVal data As Dictionary(Of String, Object)) As String
    ' Does some stuff

    ' Sending email
    Dim sSendEmail As New Thread(Sub() SendEmailTo("test subject", "test body"))
    sSendEmail.IsBackground = True
    sSendEmail.Start()

    Return "Test" & ".pdf"
End Function

Private Shared Sub SendEmailTo(subject As String, body As String)
    Using mm As New MailMessage("from@gmail.com", "to@gmail.com")
        mm.Subject = subject
        mm.Body = body
        mm.IsBodyHtml = False
        Dim smtp As New SmtpClient()
        smtp.Host = "smtp.gmail.com"
        smtp.EnableSsl = True
        Dim NetworkCred As New NetworkCredential("from@gmail.com", "password")
        smtp.UseDefaultCredentials = True
        smtp.Credentials = NetworkCred
        smtp.Port = 587
        smtp.Send(mm)
    End Using
End Sub