string src=UrlHelper.GenerateContentUrl("~/Content/фотографии/фотография.jpg",this.HttpContext)string src=Url.Content("~/Content/фотографии/фотография.jpg") WebUserControl myControl = new WebUserControl();
form1.Controls.Add(myControl);WebUserControl myControl = (WebUserControl)LoadControl("~/WebUserControl.ascx");
form1.Controls.Add(myControl);<%@ Register Src="~/WebUserControl.ascx" TagPrefix="мойКонтрол" TagName="WebUserControl" %>