change the value of dropdown list after form submition ASP.NET MVC

Question

I have a very strange problem. I want to change selected value of the dropdownlist after form submition. I know that HtmlHelper is retrieving the ModelState value, which is filled with the posted data. But I have a redirect from my POST action to GET action! However my ddl is populated with value submitted during the post. I've also added this code to my post action: ModelState.Clear(), but this hasn't helped me neither.

I've added another ddl to my form just for debugging;

   @Html.DropDownList("asd" + Guid.NewGuid(), Model.Voting.Result.ToSelectList())

It always appears with value provided by the server code. But the target ddl

@Html.DropDownListFor(x => x.Voting.Result, Model.Voting.Result.ToSelectList())

always has a value posted by user. How can I populate the target ddl?

If ModelState.Clear() is called before redirecting to your "get" view and that didn't help then you should double check your code as that just work. — Softlion
– Softlion, Commented Jun 5, 2011 at 19:09
I see and checked my code. But @Html.DropDownList("asd" + Guid.NewGuid(), Model.Voting.Result.ToSelectList()) works fine. So the problem might be in the method @Html.DropDownListFor — Serhiy
– Serhiy, Commented Jun 5, 2011 at 20:03

Eranga · Accepted Answer · 2011-06-05 14:19:34Z

1

You have to pass the initial value to it like

@Html.DropDownListFor(x => x.Voting.Result, 
new SelectList(Model.Voting.Result, "Id", "Name", /*initial value*/))

Use this constructor of SelectList class

Edit initially I have put the argument on wrong method

edited Jun 5, 2011 at 14:19

answered Jun 5, 2011 at 13:19

Eranga

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4 Comments

Serhiy Over a year ago

The 3rd parameter is 'object htmlAttributes' or 'string optionLabel'. I've tried to pass the value as the3rd param and this hasn't helped me.

Eranga Over a year ago

convert it to a string msdn.microsoft.com/en-us/library/dd504970(v=VS.98).aspx

Serhiy Over a year ago

making this change added one more item to the result <select> element. This item is selected. So one item is duplicated in the result ddl :(

Serhiy Over a year ago

I do use this constructor with 3rd argument specified.

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