VB.Net \ C# dataset.readxml cache problem

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C#

VB

Hi How are you?

I have an online xml file and i want to read it using dataset.readxml then insert the data in to comobox but the problem when i have change or edit the xml file and run application it's get the old data not the new data

it's read the data from cache. How i can set http headers like ( Pragma:no-cache or Cache-Control:no-cache ) to read it without cache

Thank you in advance
Sorry of my English