Error - No defining declaration found for implementing declaration of partial method

Question

Hi,
I am quite  new to c# and using lightswitch to create a webform. However, I have to write a code as per the webform logic and requirement and now getting error on this part -
partial
voidgridDeleteSelected_Execute(StringID)
The error is -  No defining declaration found for implementing declaration of partial
method
Could someone please tell how this error can be resolved ? Please find the code attached below.
Thanks.
using System;
using System.Linq;
using System.IO;
using System.IO.IsolatedStorage;
using System.Collections.Generic;
using Microsoft.LightSwitch;
using Microsoft.LightSwitch.Framework.Client;
using Microsoft.LightSwitch.Presentation;
using Microsoft.LightSwitch.Presentation.Extensions;
namespace LightSwitchApplication
public partial class EditableServicesGrid
partial void gridDeleteSelected_CanExecute(ref bool result)
partial void gridDeleteSelected_Execute(String ID)
if (!string.IsNullOrEmpty(ID))
string sqldelete = "Update services set DELETED_FLG = 'Y' WHERE ID IN ( " + ID + ")";

Answer 1

partial
voidgridDeleteSelected_Execute(StringID)
The error is -  No defining declaration found for implementing declaration of partial
method
Could someone please tell how this error can be resolved ? Please find the code attached below.
Could you explanation what your requirement is? detailed information is necessary.