Question

Working On Simple Entity Frame Work sample with Combo Box . i am trying to populate datagridview on the basis of combo Box selections but i am getting casting error

I have Simple MDF database and i used database first to generate model for EF .
in EF , NiftyFO is a model consists of TradId, StrikePrice , VolumeTraded etc ..

        NiftyEntities nf = new NiftyEntities();
        NiftyFO nfo = new NiftyFO();

        nfo = (NiftyFO)(comboBox1.SelectedItem);

         var result = from x in nf.NiftyFOes
                     where x.StrikePrice ==nfo.StrikePrice
                     select x;
        dataGridView1.DataSource = result;
        dataGridView1.Refresh();

And the exact error it showing wheni change ComboBox Seletion is

 Unable to cast object of type '<>f__AnonymousType0`1[System.Nullable`1[System.Decimal]] 
     to type 'agileLocal.NiftyFO.'

and

Combo Box Filled with Strike Price and loaded from the databse throgh the ef and code goes like this

             NiftyEntities nf = new NiftyEntities();
          var result2 = from x in nf.NiftyFOes
                          select new { x.StrikePrice };
            //comboBox1.DisplayMember = "StrikePrice";
            comboBox1.DataSource = result2;

Solved :

select new { x.StrikePrice }; 

i just changed this line

select x.StrikePrice . and it worked .

Answer 1

then your code will be

   decimal myselected = (decimal)(comboBox1.SelectedItem);


 var result = from x in nf.NiftyFOes
                 where x.StrikePrice == myselected 
                 select x;
    dataGridView1.DataSource = result;
    dataGridView1.Refresh();

because in your select new { x.StrikePrice }; you are selecting the StrikePrice and not the object it self