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Categories / ASP.Net Tutorial / Custom Controls

 

Handling postback events in a server control (C#)

using System.ComponentModel; using System.Text; using System.Web.UI; using System.Web.UI.WebControls; namespace WebControlLibrary1 {     [DefaultProperty("Text")]     [ToolboxData("<{0}:WebCustomControl3 runat=server></{0}:WebCustomControl3>")]     public class WebCustomControl3 : WebControl, IPostBackEventHandler     {         protected override void Render(HtmlTextWriter output)         {             PostBackOptions p = new PostBackOptions(this);             output.AddAttribute(HtmlTextWriterAttribute.Onclick,Page.ClientScript.GetPostBackEventReference(p));             output.AddAttribute(HtmlTextWriterAttribute.Value, "My Button");             output.AddAttribute(HtmlTextWriterAttribute.Id, this.ClientID);             output.AddAttribute(HtmlTextWriterAttribute.Name, this.ClientID);             output.RenderBeginTag(HtmlTextWriterTag.Button);             output.RenderEndTag();         }         #region IPostBackEventHandler Members         public event EventHandler Click;         public virtual void OnClick(EventArgs e)         {             if (Click != null)             {                 Click(this, e);             }         }         public void RaisePostBackEvent(string eventArgument)         {             OnClick(EventArgs.Empty);         }         #endregion          } }