How do you post a xml element to api in VB.net

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C#5.0

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I have been googling this and cant seem to find a simple explanation of how to do this so if anyone could maybe point me to a site where I can find some information on how to do this that would be great.

I have edited the question to make it a bit easier to understand.

I am sending out sms's via the internet at the moment I use a http api where I send the sms one by one which is a bit slow when sending thousands.So they have told me that using the xml method would be better , I assumed that I would create the xml file using there format below and would be able to send that way.How im going to get the data from the tab delimeted file into the xml format is my next problem , but for now I just want to see if I can post the xml file and get it to send the sms's.

This is from there site :-

The XML generated has to be posted on the URL.

http://login.smsgatewayhub.com/xmlapi/pushsms.aspx?data=

XML Format from there site

<smsqueue>
<account>
<user>userid
<password>password

<messagedata>
<senderid>WEBSMS
<gwid>1
<datacoding>0
<messages><message>
<to>9199xxxxxxxx00<text>First Test xml<message><to>9199xxxxxxxx00<text>Second TTT xml