1: public class DoubleClickExtender : Control

   2: {

   3:     public DoubleClickExtender()

   4:     {

   5:         PreRender += new EventHandler(DoubleClickExtender_PreRender);

   6:     }

   7:  

   8:     void DoubleClickExtender_PreRender(object sender, EventArgs e)

   9:     {

  10:         // Register validation script

  11:         Page.ClientScript.RegisterClientScriptResource(GetType(), "Vp.Core.Web.UI.Extenders.js");

  12:  

  13:         WebControl control = NamingContainer.FindControl(TargetControlID) as WebControl;

  14:         IButtonControl button = control as IButtonControl;

  15:  

  16:         if (control != null && button != null)

  17:         {

  18:             control.Attributes.Add("onclick", "return CheckAndDisableControl(this);");

  19:             RegisterExpandoAttribute(control, "validationgroup", button.ValidationGroup, true);

  20:             RegisterExpandoAttribute(control, "isblocked", "false", true);

  21:         }

  22:     }

  23:  

  24:     [IDReferenceProperty]

  25:     public string TargetControlID

  26:     {

  27:         get { return ViewState["TargetControlID"] as string; }

  28:         set { ViewState["TargetControlID"] = value; }

  29:     }

  30: }

   1: function CheckAndDisableControl(button)

   2: {

   3:     if (typeof(Page_Validators) == "undefined")

   4:     {

   5:         return Block(button);

   6:     }

   7:     

   8:     if (typeof(Page_ClientValidate) == 'function')

   9:     {

  10:         Page_ClientValidate(button.validationgroup);

  11:         if(Page_IsValid)

  12:         {

  13:             return Block(button)

  14:         }

  15:     }

  16:     else

  17:     {

  18:         return Block(button);

  19:     }

  20: }

  21:  

  22: function Block(control)

  23: {

  24:     if (control.isblocked == "false")

  25:     {

  26:         control.isblocked = "true";

  27:         return true;

  28:     }

  29:     else

  30:     {

  31:         return false;

  32:     }

  33: }