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Leitura de XML



Bom Dia a Todos.

recebo um xml de um webservice, e o coloco em uma varivel string, depois eu o transformo em um xml

Dim teste As String = System.Text.Encoding.ASCII.GetString(bytRetData)

Dim oXml As New Xml.XmlDocument

Dim strOrderNumber As String


até ai tudo bem, porem eu preciso pegar um texto desse xml

strOrderNumber = oXml.FirstChild.Item("/env:Envelope/env:Header/wsa:MessageID").InnerText.ToString

mas me da um erro

An unhandled exception of type 'System.NullReferenceException' occurred in WindowsApplication1.exe

Additional information: Object reference not set to an instance of an object.

não sei o que fazer para arrumar isso, e nem aonde estou errando

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