string str=""解决方案

string str="";
string str = System.Globalization.CultureInfo.InstalledUICulture.NativeName;
  Response.Write("<script>alert('" + str + "')</script>");

[解决办法]
System.Globalization.CultureInfo.InstalledUICulture.Name；
System.Globalization.CultureInfo.InstalledUICulture.NativeName；