ASP.NET

<script type="text/javascript">
function Open(IdNeed)
{
var grid = document.getElementById('<%=gvEstelam.ClientID%>');
grid.rows[1].cells[4].innerHTML = 152;
alert(grid.rows[1].cells[4].innerHTML);
}

<asp:TemplateField>
                                    <ItemTemplate>
                                        <asp:ImageButton ID="ImageEstelamBuyingKala" ImageUrl="~/ServerFile/ApplicationFiles/Icons/Button/add.png"
                                            Width="25" runat="server" OnClientClick='<%# " Open("+ DataBinder.Eval(Container.DataItem,"Id") + ");" %>' />
                                    </ItemTemplate>
                                </asp:TemplateField>

<script language="JavaScript" type="text/javascript">

        $(document).ready(function() {



    function confirmDelete()
         {
             if (confirm('It will delete your file. Is that Ok?'))
            {
                document.getElementById('<%= radbutSelector.ClientID %>').click();
                return true;
            }
            return false;
        }

    </script>

<asp:radiobuttonlist id="radWantEnter" runat="server"
                RepeatDirection="Horizontal" RepeatLayout="Flow" CssClass="radio"
                   AutoPostBack="True" onclick="return confirmDelete();"
                   >
     <asp:Button Text="hiddenButton" ID="radbutSelector" runat="server" Style="display: none;"
       OnClick="radbutSelector_Click" />

protected void radbutSelector_Click(object sender, EventArgs e)
      {


              if (radWantEnter.SelectedValue == "Yes")
              {
                  pnl1.Visible = true;

              }

              else
              {
                  pnl2.Visible = false;

              }

      }

 public ViewResult Index(int userID, string userName)
        {
            Person person = new Person();
            //this assigns person.Id to the user Id
            person.Id = userID;
            //i want to assign name of person to the string userName
             userName = person.name;
}

public ActionResult Create()
        {           
            string xx = (string)Session["usernameID"];
            int? currentPersonID = Convert.ToInt32(xx);

            string userNameComparedAgainstLoginName = // here is where i want to say 'name' of logged in user

            CreateModel model = new CreateModel();
            model.currentPersonID = currentPersonID.Value;
            model.PList4DD = db.People.ToList();   
           

            if (userNameComparedAgainstLoginName == model.userName)
            {
                ViewBag.Id = new SelectList(db.People, "Id", "Name");
                return View(model);
            }
            else
            {
                TempData["canOnlyBookHolidaysForYourself"] = "I'm afraid you can only book holidays for yourself";
                return RedirectToAction("Index");
            }
        }