There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'UserName'.

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ASP.NET

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MVC5

I'm getting above mention and not able to figure out what exactly error is.
code is working fine for other but only for a single table i'm getting error.
Please help
This is controller code

ViewBag.User = new SelectList(context.Users, "UserName", "UserName");

this is View code.

@Html.DropDownList("UserName", (IEnumerabl<SelectListItem>)ViewBag.User, "Select User")

Please help