using System; using System.Data; using System.Web; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace MyCompany.WebUI.MyClasses { public class MyLabel: System.Web.UI.WebControls.Label { private string m_MyProperty; // properties public string MyProperty { get {return this.m_MyProperty;} set {this.m_MyProperty = value;} } } public class MyTextBox : System.Web.UI.WebControls.TextBox { // code here } public class MyButton : System.Web.UI.WebControls.Button { // code here } }Add these to the ToolBox by right-clicking on the ToolBox and choosing Add/Remove Items.