Hi,
I am developing Custom server control(Ex : MyRadListBox) by inheriting from RadListBox. And I need RequiredFieldValidator inside the MyRadListBox class. Means need a RequiredFieldvalidator feature with My Custom server control. But its giving error like "Unable to find control id 'MyListBox1' referenced by the 'ControlToValidate' property of ''.
My Code is
But If I inherit from simple ASP Listbox it works fine. Look at below code:
I am not getting why its not working with RadListBox and why its working with normal asp ListBox control?
Please kindly help me to resolve this problem.
Thanks
Vinayak
I am developing Custom server control(Ex : MyRadListBox) by inheriting from RadListBox. And I need RequiredFieldValidator inside the MyRadListBox class. Means need a RequiredFieldvalidator feature with My Custom server control. But its giving error like "Unable to find control id 'MyListBox1' referenced by the 'ControlToValidate' property of ''.
My Code is
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Telerik.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI;
namespace WebApplication1
{
public class MyListBox : RadListBox
{
RequiredFieldValidator rfv ;
protected override void CreateChildControls()
{
rfv = new RequiredFieldValidator();
rfv.ControlToValidate = this.ID;
rfv.ErrorMessage = "This is required";
rfv.EnableClientScript = true;
base.Controls.Add(rfv);
base.CreateChildControls();
}
protected override void Render(HtmlTextWriter writer)
{
base.Render(writer);
rfv.RenderControl(writer);
}
}
}
But If I inherit from simple ASP Listbox it works fine. Look at below code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Telerik.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI;
namespace WebApplication1
{
public class MyListBox : ListBox
{
RequiredFieldValidator rfv ;
protected override void CreateChildControls()
{
rfv = new RequiredFieldValidator();
rfv.ControlToValidate = this.ID;
rfv.ErrorMessage = "This is required";
rfv.EnableClientScript = true;
base.Controls.Add(rfv);
base.CreateChildControls();
}
protected override void Render(HtmlTextWriter writer)
{
base.Render(writer);
rfv.RenderControl(writer);
}
}
}
I am not getting why its not working with RadListBox and why its working with normal asp ListBox control?
Please kindly help me to resolve this problem.
Thanks
Vinayak