I want to pass the selected value from controller to view

Hi,

I am very new to asp.net MVC and have my first project in hand.

I am having 2 pages Home and Attendance.

In Home controller, i am getting 3 client names C1, C2, C3 from database in my dropdownlistfor.

View

@model WebApplication1.Models.ClientMdl
@{
ViewBag.Title = "Index";
}
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@using (Html.BeginForm("Index", "Home",FormMethod.Post,new { id="Frm1"}))
{
                Select Client name
                @Html.DropDownListFor(model => model.Client_Names, new SelectList(Model.Clients, "Client_Names", "Client_Names"), "Select Client", new { onchange = "document.getElementById('Frm1').submit();" })

                @*                @Html.TextBoxFor(model => model.Client_Names)*@
                @Html.ValidationMessageFor(model => model.Client_Names)
                "submit" value="Submit" />
}

I want user to select client name and click on submit. This saves the selected client name in a global variable which will be used across pages.

Home Controller

namespace WebApplication1.Controllers
{
public class HomeController : Controller
{
MdlCnStringContextClass _mdlCntxtcls = new MdlCnStringContextClass();
GlobalVaCls GVaCls = new GlobalVaCls();
GlblAttendanceCls glblAttendanceCls = new GlblAttendanceCls();
ClientMdl clntMdl = new ClientMdl();
/* public ActionResult Index()
{
Client clntMdlObj = new Client();
clntMdlObj.Clients = GetAllClientNames();
return View(clntMdlObj);
}
private List GetAllClientNames()
{
List CNames = new List();
CNames = _mdlCntxtcls.clients.Select( c => new SelectListItem { Value=c.ClientID.ToString(),Text=c.Client_Names.ToString()}).ToList();
return (CNames);
}*/
[HttpGet]
public ActionResult Index()
{
clntMdl.Clients = GetClientNames(clntMdl);
int InOutRws = glblAttendanceCls.Attendance();
if (GlobalVaCls.SelectedClient != null)
{
ViewBag.VBg = GlobalVaCls.SelectedClient;
ViewBag.InOtRwsCnt = InOutRws;
if (InOutRws > 0)
{
var vClientNames = _mdlCntxtcls.Clients
.Select(c => c.Client_Names);
return View(clntMdl);
}
else
{
return View(clntMdl);
}
}
else
{
return View(clntMdl);
}
}
[HttpPost ]
public ActionResult Index(ClientMdl client)
{
int InOutRws = glblAttendanceCls.Attendance();
ViewBag.InOtRwsCnt = InOutRws;
//Use this statement when getting the value of Dropdown text from View
string Client_Names = client.Client_Names.ToString();
//Gets the Client name from textbox in Index View
//string strClient = client.Client_Names;
//ViewBag.M = strClient;
GlobalVaCls.SelectedClient = client.Client_Names;
clntMdl.Clients = GetClientNames(clntMdl);
return View(clntMdl);
}
}

When i am on Attendance page and clicking Home link to browse to Home page. I want the client name which was saved in global variable to be the text of the dropdownlist in Home page.

But i am facing an error as Object not set to an Instance in this statement

@Html.DropDownListFor(model => model.Client_Names, new SelectList(Model.Clients, "Client_Names", "Client_Names"), "Select Client", new { onchange = "document.getElementById('Frm1').submit();" })

Here is where i need your help. Please revert if you need more clarifications.

Actually in MVC page do not load directly first it call action which return view as shown below.

public ActionResult Index()
{
Client clntMdlObj = new Client();
clntMdlObj.Clients = GetAllClientNames();
return View(clntMdlObj);
}

Assume this is the action which load your view. Then you can declare and assign a session variable before returning the view as shown below.

public ActionResult Index()
{
Client clntMdlObj = new Client();
clntMdlObj.Clients = GetAllClientNames();
Session["Clients"] = GetClientNames(clntMdl);
return View(clntMdlObj);
}

Now you can access this session variable in view as said earlier.

If you want to store session variable on change of dropdownlist then you can call an action which will assign session variable and return json value as shown below.

public JsonResult fnname()
{
Session["Clients"] = GetClientNames(clntMdl);
return Json("" , JsonRequestBehavior.AllowGet);
}

Hope this will help you.

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Suraj Kumar7y ago
Actually in MVC page do not load directly first it call action which return view as shown below.
public ActionResult Index()
{
    Client clntMdlObj = new Client();
    clntMdlObj.Clients = GetAllClientNames();
    return View(clntMdlObj);
}
Assume this is the action which load your view. Then you can declare and assign a session variable before returning the view as shown below.
public ActionResult Index()
{
    Client clntMdlObj = new Client();
    clntMdlObj.Clients = GetAllClientNames();

    Session["Clients"] = GetClientNames(clntMdl);
    return View(clntMdlObj);
}
Now you can access this session variable in view as said earlier.
If you want to store session variable on change of dropdownlist then you can call an action which will assign session variable and return json value as shown below.
public JsonResult fnname()
{
        Session["Clients"] = GetClientNames(clntMdl);
        return Json("" , JsonRequestBehavior.AllowGet);
}
Hope this will help you.
jimmit raval7y ago
Hi Suraj,

Thank you, thats a nice idea.

Can i set this value as text when my page loads when user clicks on Home link on my page?

It would be great if you can paste the code here.
Suraj Kumar7y ago
You can use Session variable which behaves almost similar to the Asp.net session variable as shown below. I appreciate your work done and hope you will continue further.

To assign value into the session variable.
Session["Clients"] = GetClientNames(clntMdl);
To access the session variable in view
var clientName = '<%= Session["Clients"] %>';
or
var clientName='@Session["Clients"]';
Hope this will help you.

I want to pass the selected value from controller to view

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