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How to select distinct value in dropdownlist?

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Hlo 

Currently i want to select distinct from my database and display into my dropdownlist, but my code doesn't work well.

Here Is my Code

<div> public void Filldropdownlist()</div> <div>        {</div> <div>            using (SchoolEntities2 ctx = new SchoolEntities2())</div> <div> </div> <div> </div> <div>                dd3.DataSource = (from SchoolEntities2 in ctx.packages select SchoolEntities2).Distinct().ToList();</div> <div>               dd3.DataBind();</div> <div>        }</div>

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