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How to maintain state of Html.Listbox() in ASP.NET MVC

Hi,

I have just started wrking on Asp.net MVC. For filtering a table i am using a Html.listbox() to select multiple items and a button to apply filter on the table. 

<%=Html.ListBox("CategoryOptions", new MultiSelectList(TypeModel.Category))%>

But after clicking the filter button ,the listbox doesn't show(maintain) the items as selected .Can anybody help me in this ?

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