How to Upload Image using Webmethod

[WebMethod]
public string MarkAttendance (string Location,string UserImageUrl, string UserSelfImgaeBase64)
{
    string strFileDir = "Doc\\" + Location + "\\";
    DirectoryInfo di = new DirectoryInfo(HttpContext.Current.Server.MapPath(strFileDir));

    if (di.Exists == false)
    {
        di.Create();
    }

    byte[] imageBytes = Convert.FromBase64String(UserSelfImgaeBase64);
    string filePath = Path.Combine(di.FullName, UserImageUrl);
    File.WriteAllBytes(filePath, imageBytes);
    try
    {
        return "In Punch Successfully Marked ! ";
    }
    }
    catch (Exception ex)
    {
        return "Error : " + ex.Message;
    }
}