public class GetStudentNo
{
    private readonly IJSRuntime js;
    public GetStudentNo(IJSRuntime js)
    {
        this.js = js;
    }

    public  async Task<string> getStudentNo()
    {
        string studentno = string.Empty;
        var userdata = await js.InvokeAsync<string>("localStorage.getItem", "user").ConfigureAwait(false);
        if (!string.IsNullOrWhiteSpace(userdata))
        {
            var datArray = userdata.Split(';', 3);
            studentno = datArray[2].ToString();
        }
        return studentno;
    }


}