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POHow do I perform multiple async calls to a ASP.Net webservice from .NET Winforms?
 

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  1. POHow do I perform multiple async calls to a ASP.Net webservice from .NET Winforms?
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    <p>I would like to use my webservice but I can't seem to call multiple async functions... Other than cascading from one AsyncCompleted to start another??</p> <p>Imports picklists.MyWebService</p> <p>Public Class main</p> <pre><code>Dim WithEvents ws As New picklists.MyWebService.picklists Private Sub main_Load(sender As Object, e As EventArgs) Handles MyBase.Load ws.GetCustomersAsDatatableAsync() ws.GetRoutesAsDatatableAsync() End Sub Private Sub ws_GetCustomersAsDatatableCompleted(sender As Object, e As GetCustomersAsDatatableCompletedEventArgs) Handles ws.GetCustomersAsDatatableCompleted Dim dt As DataTable = CType(e.Result, DataTable) cmb_customer.DataSource = dt cmb_customer.DisplayMember = "NAME" End Sub Private Sub ws_GetRoutesAsDatatableCompleted(sender As Object, e As GetRoutesAsDatatableCompletedEventArgs) Handles ws.GetRoutesAsDatatableCompleted Dim dt As DataTable = CType(e.Result, DataTable) cmb_route.DataSource = dt cmb_route.DisplayMember = "NAME" End Sub </code></pre> <p>Innerexception: <strong>{"There was an error during asynchronous processing. Unique state object is required for multiple asynchronous simultaneous operations to be outstanding."}</strong></p> <p><strong>EDIT/SOLUTION</strong>:</p> <pre><code>Imports picklists.MyWebService Public Class main Dim WithEvents ws As New picklists.MyWebService.picklists Private Sub main_Load(sender As Object, e As EventArgs) Handles MyBase.Load ws.GetCustomersAsDatatableAsync(Guid.NewGuid.ToString) ws.GetRoutesAsDatatableAsync(Guid.NewGuid.ToString) End Sub Private Sub ws_GetCustomersAsDatatableCompleted(sender As Object, e As GetCustomersAsDatatableCompletedEventArgs) Handles ws.GetCustomersAsDatatableCompleted Dim g As String = e.UserState Dim dt As DataTable = CType(e.Result, DataTable) cmb_customer.DataSource = dt cmb_customer.DisplayMember = "NAME" End Sub Private Sub ws_GetRoutesAsDatatableCompleted(sender As Object, e As GetRoutesAsDatatableCompletedEventArgs) Handles ws.GetRoutesAsDatatableCompleted Dim g As String = e.UserState Dim dt As DataTable = CType(e.Result, DataTable) cmb_route.DataSource = dt cmb_route.DisplayMember = "NAME" End Sub </code></pre>
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      1. POHow do I perform multiple async calls to a ASP.Net webservice from .NET Winforms?
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      1. POHow do I perform multiple async calls to a ASP.Net webservice from .NET Winforms?
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    1. COWhat have you done so far? Show us your code. What exactly can't you implement?
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      1. POHow do I perform multiple async calls to a ASP.Net webservice from .NET Winforms?
      1. USDmitry Dovgopoly
    2. COSee updated above.
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      1. POHow do I perform multiple async calls to a ASP.Net webservice from .NET Winforms?
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