>I have this method to add a namespace from my XML class:
>
>

>    ' Add a namespace
>    Public Function AddNamespace() As Boolean
>        Dim lcNamespace As String = ""
>        Dim lcUri As String = ""
>        Dim llSuccess As Boolean = False
>
>        ' Reset the values
>        cMessage = ""
>
>        ' Initialization
>        lcNamespace = Trim(cNamespace)
>        lcUri = Trim(cUri)
>
>        ' If we have a Uri
>        If lcUri.Length > 0 Then
>
>            ' If we have a namespace
>            If lcNamespace.Length > 0 Then
>
>                Try
>
>                    ' Create the XmlNameSpaceManager object once
>                    ' This is needed as we could add several namespaces
>                    If oXmlNameSpaceManager Is Nothing Then
>                        oXmlNameSpaceManager = New XmlNamespaceManager(oXmlDocument.NameTable)
>                    End If
>
>                    oXmlNameSpaceManager.AddNamespace(lcNamespace, lcUri)
>                    llSuccess = True
>                Catch loException As Exception
>                    cMessage = loException.Message
>                End Try
>
>            Else
>                cMessage = cYouNeedToDefineTheNamespaceProperty
>            End If
>        Else
>            cMessage = cYouNeedToDefineTheUriProperty
>        End If
>
>        ' Reset the values
>        cNamespace = ""
>        cUri = ""
>
>        Return llSuccess
>    End Function
>

>
>However, I just found out that even if the namespace does not exist, this will not go in the Catch as an exception.
>
>I would like to make an adjustment that if the namespace does not exist, that it will go in the exception.
>
>Is there a way to verify if a namespace exists?

https://msdn.microsoft.com/en-us/library/system.xml.xmlnamespacemanager.hasnamespace(v=vs.110).aspx ?