x.CheckUserAndPassword(txtUsername.Text, txtCurrentPassword.Text, txtNewPassword.Text) Then

True

"Change Success"

Threading.Thread.Sleep(5000)

Response.Redirect(

"~/Login.aspx", False)

Else

"Try Again, Your username or password does not match"

End If

I try create MossRadEditor Custom Field in SharePoint when build & debug I run pass but on webpage error "An unexpected error has occurred" :(.

file ascx:

<%@ Control Language="C#" Debug=true %>
<%@ Register Assembly="RadEditorSharePoint, Version=5.3.0.0, Culture=neutral, PublicKeyToken=1f131a624888eeed" 
Namespace="Telerik.SharePoint" TagPrefix="cc1" %>
<%@ Register TagPrefix="SharePoint" Assembly="Microsoft.SharePoint, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" Namespace="Microsoft.SharePoint.WebControls" %>   
<SharePoint:RenderingTemplate ID="CMSDropDownFieldControl" runat="server"> 
<Template>
<cc1:MOSSRadEditor ID="MOSSRadEditor1" runat="server" Width ="450px" Height ="400px">
</cc1:MOSSRadEditor> 
</Template>
</SharePoint:RenderingTemplate>

CMSDropDownFieldControl.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI.WebControls;
using Microsoft.SharePoint.WebControls;

using System.Security.Principal;
using System.Security.Permissions;

using Microsoft.SharePoint;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using Telerik.SharePoint;

namespace Prevail.CMS.CustomFields
{
    class CMSDropDownFieldControl : BaseFieldControl
    {
        protected MOSSRadEditor mossRadEditor;

        protected override string DefaultTemplateName
        {
            get
            {
                return "CMSDropDownFieldControl";
            }
        }

        public override object Value
        {
            get
            {
                EnsureChildControls();
                return mossRadEditor.Text;
            }

            set
            {
                EnsureChildControls();
                mossRadEditor.Text = (string)this.ItemFieldValue;
            }
        }

        public override void Focus()
        {
            EnsureChildControls();           
        }

        protected override void CreateChildControls()
        {
            if (Field == null) return;
            base.CreateChildControls();
            try
            {

                if (ControlMode == Microsoft.SharePoint.WebControls.SPControlMode.Display)
                    return;                           
                mossRadEditor = (MOSSRadEditor)TemplateContainer.FindControl("MOSSRadEditor1");               
            }
            catch (SPException ex)
            {
               
            }

        }
    }
}

CMSDropDownField.cs
using System; 
using System.Collections.Generic; 
using System.Text; 
using Microsoft.SharePoint; 

namespace Prevail.CMS.CustomFields  
 { 
    public class CMSDropDownField:SPFieldText   

{

#region
Constructors
public CMSDropDownField(SPFieldCollection fields, string fieldName) : base(fields, fieldName)
 
 {

}

public CMSDropDownField(Microsoft.SharePoint.SPFieldCollection fields, string typeName, string displayName) : base(fields, typeName, displayName)
{
}
#endregion

/// <summary> 
/// Here we can apply formating to our number that will show up on the edit page.
/// </summary>
/// <param name="value"></param>  
/// <returns></returns>
public override object GetFieldValue(string value)  
{
if (String.IsNullOrEmpty(value))  
return null; 
return value;
}
public override Microsoft.SharePoint.WebControls.BaseFieldControl FieldRenderingControl  
{
get
{

Microsoft.SharePoint.WebControls.BaseFieldControl _CMSDropDownFieldControl = new CMSDropDownFieldControl();
 _CMSDropDownFieldControl.FieldName = InternalName;
return _CMSDropDownFieldControl;  
}

}

}

}

Thanks
Imtiaz