ASP.NET

Pls Provide me business logic method for reset password or forget password by user id...

List<UserModel> oUserModel

@model List<MVCCRUDPageList.Controllers.UserModel>

@using (Html.BeginForm(null,null,FormMethod.Post))
{
    var grid = new WebGrid(Model);
    var rowNum = 0;
    
    <div id="gridContent" style=" padding:20px; ">
    @grid.GetHtml(
        tableStyle: "table",
        alternatingRowStyle: "alternate",
        selectedRowStyle: "selected",
        headerStyle: "header",
        columns: grid.Columns
        (
            //grid.Column("RowNumber", style: "HideFirstCol", format: item => rowNum = rowNum + 1),
            grid.Column(null, null, format: @<input type="hidden" name="IDHidden" value="rowNum + 1" />),
            grid.Column("First Name",
                        style: "col2",
                        format: @<text>
                        @Html.TextBox("UserModel[" + (rowNum - 1).ToString() + "].FirstName", (object)item.FirstName)
                        </text>),


            grid.Column("Last Name",
                        style: "col2",
                        format: @<text>
                        @Html.TextBox("UserModel[" + (rowNum - 1).ToString() + "].LastName", (object)item.LastName)
                        </text>)
        ))
    </div>
    <input type="submit" name="SaveButton" value="Save" />
}

public class WebGridEditableController : Controller
    {
        // GET: WebGridEditable
        public ActionResult Index()
        {
            List<UserModel> users = UserModel.getUsers();
            return View(users);
        }

        // GET: WebGridEditable
        [HttpPost]
        public ActionResult Index(List<UserModel> oUserModel)
        {
            return View(oUserModel);
        }
    }

    public class UserModel
    {
        public int ID { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }

        public static List<UserModel> getUsers()
        {
            List<UserModel> users = new List<UserModel>()  
            {  
                new UserModel (){ ID=1, FirstName="Anubhav", LastName="Chaudhary" },   
                new UserModel (){ ID=2, FirstName="Mohit", LastName="Singh" },  
                new UserModel (){ ID=3, FirstName="Sonu", LastName="Garg" },  
                new UserModel (){ ID=4, FirstName="Shalini", LastName="Goel" },  
                new UserModel (){ ID=5, FirstName="James", LastName="Bond" },  
            };
            return users;
        }
    }

public ActionResult Index(String ColumnName,String SearchText)
{

    private CustomersEntities db = new CustomersEntities();

    var customer = (from s in db.Customers
                    select new CustomerDTO
                    {
                    CustomerID = s.CustomerID,
                    CompanyName = s.CompanyName,
                    ContactName = s.ContactName,
                    ContactTitle = s.ContactTitle,
                    Address = s.Address
                    })
    .Where(s => s.Field<string>(ColumnName).ToUpper().Contains(SearchText.ToUpper());

    return View(customer);

}

var query = from s in db.Customers select s;
if (ColumnName == "CompanyName")
            {
                query = query.Where(c => c.CompanyName == SearchText);
            }
            else if (ColumnName == "ContactName")
            {
                query = query.Where(c => c.ContactName == SearchText);
            }