The below code will open the default browser and navigate to the website.
string target= "http://www.google.com";
try
{
System.Diagnostics.Process.Start(target);
}
catch(System.ComponentModel.Win32Exception noBrowser)
{
if (noBrowser.ErrorCode==-2147467259)
MessageBox.Show(noBrowser.Message);
}
catch (System.Exception other)
{
MessageBox.Show(other.Message);
}
Also, do you want to pass the credentials? You can pass them as encrypted parameters in the query string or you can also use cookies.