If you are trying to open a new blank window with a web browser outside of your vb.net application you can accomplish that like this.
For Internet Explorer
vb.net Code:
Process.Start("IExplore.exe", "about:blank")
For Chrome
vb.net Code:
Process.Start("chrome.exe", "about:blank")
For Firefox 64bit
vb.net Code:
Process.Start("C:\Program Files (x86)\Mozilla Firefox\firefox.exe", "about:blank")
For Firefox 32bit
vb.net Code:
Process.Start("C:\Program Files\Mozilla Firefox\firefox.exe", "about:blank")
If you are trying to open a blank page with the built in web browser for your vb.net application then you can do that like this.
vb.net Code:
WebBrowser1.DocumentText = ""
or this way would also work.
vb.net Code:
WebBrowser1.Navigate("about:blank")