setting Icons to Code activity and designer theme

First To set the Icon to Activity set the property to "EmbededResourse" . Code comes here.
#region look n feel
internal sealed class ApproveRequestCustomActivityDesignerTheme : ActivityDesignerTheme { public ApproveRequestCustomActivityDesignerTheme(WorkflowTheme theme) : base(theme) { this.BorderColor = Color.Chocolate ;
this.BorderStyle = System.Drawing.Drawing2D.DashStyle.Solid;//DashStyle.Solid;
this.BackColorStart = Color.BurlyWood ;
this.BackColorEnd = Color.CornflowerBlue;
this.BackgroundStyle = System.Drawing.Drawing2D.LinearGradientMode.Vertical; //LinearGradientMode.Vertical; } } [ActivityDesignerThemeAttribute(typeof(ApproveRequestCustomActivityDesignerTheme))] public class ApproveRequestCustomActivityDesigner : ActivityDesigner { } #endregion [ToolboxItemAttribute(typeof(ActivityToolboxItem))] [Designer(typeof(ApproveRequestCustomActivityDesigner), typeof(IDesigner))] [ToolboxBitmap(typeof(ApproveRequestActivity), "Resources.ApprovalReq.bmp")]