protected void Page_Load(object sender, EventArgs e) { var spContext = SharePointContextProvider.Current.GetSharePointContext(Context); using (var clientContext = spContext.CreateUserClientContextForSPAppWeb()) { //set access token in hidden field for client calls hdnAccessToken.Value = spContext.UserAccessTokenForSPAppWeb; //set images Image1.ImageUrl = spContext.SPAppWebUrl + "AppImages/O365.png"; Services.ImgService svc = new Services.ImgService(); Image2.ImageUrl = svc.GetImage(spContext.UserAccessTokenForSPAppWeb, spContext.SPAppWebUrl.ToString(), "AppImages", "O365.png"); } }