为什么从查询字符串中删除反斜杠 - ASP.NET和Javascript

I am trying to generate a URL that contains a UNC path as one of the query string variables. The URL will open in a pop up window when an ASP.NET button control is clicked by the user. When the clicks the button, the backwards slashes are removed from the UNC path causing the page to break.I am trying to generate a URL that contains a U