How to populate the Drop Down List with the help of ViewBag()?

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Hello,

I do not know what is wrong in my code. following are the code classes respectively, and getting the error ArgumentNullException :

I am using the DB first approach.

Here is my model class:

XML

public partial class Employee
    {
        public int EmployeeID { get; set; }
        public Nullable<int> EmployeeTypeID { get; set; }
        public int DepartmentID { get; set; }
        public int GradeID { get; set; }

        public virtual ICollection<BillingLinkedPersonnel> BillingLinkedPersonnels { get; set; }
        public virtual Department Department { get; set; }
        public virtual EmployeeType EmployeeType { get; set; }
        public virtual ICollection<EmployeeDetail> EmployeeDetails { get; set; }
        public virtual ICollection<EmployeeEducationDetail> EmployeeEducationDetails { get; set; }
        public virtual ICollection<EmployeeLeave> EmployeeLeaves { get; set; }
        public virtual Grade Grade { get; set; }
    }

Now here is my controller class ViewBag object method:

ViewBag.EmployeeTypeName = from EmployeeType in employee.EmployeeType.Name select new SelectListItem() { Text = employee.EmployeeType.Name, Value = employee.EmployeeType.EmployeeTypeID.ToString()};

Now here is my view DropDownListFor():

@Html.DropDownListFor(m => m.EmployeeType.Name,(IEnumerable<SelectListItem>)ViewBag.EmployeeTypeName, "select city")

Can any one tell me what is wrong with this?

Thanks

Posted 8-May-14 23:15pm

DT_2

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2 solutions

Solution 2

see with one more condition

@if(ViewBag.EmployeeTypeName !=null){
@Html.DropDownListFor(m => m.EmployeeType.Name,(IEnumerable<SelectListItem>)ViewBag.EmployeeTypeName, "select city") 
}

make a to use ToList() for viewbag object because it needs enumerable list

                    ViewBag.EmployeeTypeName = new SelectList(employee.EmployeeType.ToList(), "EmployeeTypeID", "Name", "EmployeeTypeID");
;

Posted 8-May-14 23:59pm

sankarsan parida

Updated 9-May-14 2:36am

v3

Comments

DT_2 9-May-14 6:40am

Yes Sankarsan your solution didn`t gave me the exception, now I am rendering successful to that view, but the drop down list is not there, means that space of DropDown List Box is empty. nothing is there. No text box No dropdown list.

[no name] 9-May-14 6:49am

@else{
@Html.DropDownList(m => m.EmployeeType.Name, new List<SelectListItem>{
new SelectListItem{Text="Select City",Value="Select City"} })
}

Put a else part to show blank dropdownlist

DT_2 9-May-14 6:52am

Sakarsan It is not checking that if condition.

[no name] 9-May-14 6:55am

Ok Remove @ syntax from else write like below
@if(ViewBag.EmployeeTypeName !=null){
@Html.DropDownListFor(m => m.EmployeeType.Name,(IEnumerable<SelectListItem>)ViewBag.EmployeeTypeName, "select city")
}else{
@Html.DropDownList(m => m.EmployeeType.Name, new List<SelectListItem>{
new SelectListItem{Text="Select City",Value="Select City"} })
}

DT_2 9-May-14 6:56am

Greate, blank List is there. But what about my values, it means it is checking the if condition. I have the values in my table. so how can I check or correct or solve it?

DT_2 9-May-14 7:04am

Ok I will try and get back to you Sir Ji:-)

[no name] 9-May-14 7:09am

nice :)

DT_2 9-May-14 7:56am

Sankarsan tried a lot and not reached at the solution. I think my ViewBag statement in controller is wrong. Can you tell me how to write LINQ statement instead of my linq statement?

[no name] 9-May-14 8:09am

Just update the above solution.It may helpyou

DT_2 9-May-14 8:13am

In DropDownList() we can`t write the lambda expression. I converted it to DropDownlistFor(). And not getting the list of Employee Type.

[no name] 9-May-14 8:17am

no that's for your controller class when you are assigning ViewBag.EmployeeTypeName

DT_2 9-May-14 8:28am

Tired!!! Sankarsan Sir, not get the solution why it is going to the else section.

[no name] 9-May-14 8:37am

see again updated this solution of viewbag. then if you not able to solve this problem. See one of my article http://www.codeproject.com/Articles/686768/Using-Controls-are-Dropdownlist

DT_2 10-May-14 1:27am

No, Nope!!! Not solved. any other solution for DropDownList instead using the ViewBag object?

[no name] 10-May-14 1:37am

it's same solution. Just download that demo project and run it. I have binded in different ways(Manual, database, jquery). Please go through that and see what are you missing exactly. becuase You did almost right. but something is missing that you are not getting exactly

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DT_2 · Accepted Answer · 2014-05-14T02:00:00

Controller`s Create()

List<SelectListItem> employeeListItems = new List<SelectListItem>();
           foreach (var item in _entities.Employees.ToList())
           {
               employeeListItems.Add(new SelectListItem() { Text = item.FirstName + " " + item.LastName, Value = item.EmployeeID.ToString() });
           }
           ViewBag.EmployeeList = employeeListItems;

Than the in the view

@Html.DropDownListFor(model => model.EmployeeID, (IEnumerable<SelectListItem>)ViewBag.EmployeeList })

Thank you Sankarsan Sir for helping at an highest level.