Using XML Web Service with VB.Net

Ok! I just created a VB.Net project and added web reference for other company's XML web service. Let's name the web reference as "WebRef". They have provided the web service layout and there is a function named "GetServiceTicketList". It requires "UserID", "UserPassword", and "ServiceTicketNumber".

I am trying to get a service ticket list on datagrid with "GetServiceTicketList".

When I do this, then I get a error "Value of type '1-dimensional array of String' cannot be converted to 'String' from "ls_ParamValue"

Public Function GetTicketList(ByVal strXMLin As String) As String开发者_开发技巧
   Dim results() As Object = Me.Invoke("GetServiceTicketList", New Object() {strXMLin})
   Return CType(results(0),String)
End Function

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

  Dim Client As WebRef.service1 = New WebRef.service1
  Dim XMLResoponse As String
  Dim UserId As String = "SuperMan"
  Dim UserPW As String = "Batman"
  Dim Version As String = "1234"
  Dim ls_ParamValue As String()
  ls_ParamValue = {UserId, UserPW, Version}
  XMLResoponse = Client.GetServiceTicketList(ls_ParamValue)

End Sub

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The method is declared to take a single string as a parameter. You are passing it an array of strings.