Question

I am using C# Linq now I am converting DataTable to List
and I am getting stuck…
give me right direction thanks..

    private void treeview1_Expanded(object sender, RoutedEventArgs e)
    {

        coa = new List<string>();
        //coa = (List<string>)Application.Current.Properties["CoAFull"];
        HMDAC.Hmclientdb db = new HMDAC.Hmclientdb(HMBL.Helper.GetDBPath());

        var data = (from a in db.CoA
                    where a.ParentId == 0 && a.Asset == true
                    select new { a.Asset, a.Category, a.CoAName, a.Hide, a.Recurring, a.TaxApplicable });

        DataTable dtTable = new DataTable();
        dtTable.Columns.Add("Asset", typeof(bool));
        dtTable.Columns.Add("Category", typeof(string));
        dtTable.Columns.Add("CoAName", typeof(string));
        dtTable.Columns.Add("Hide", typeof(bool));
        dtTable.Columns.Add("Recurring", typeof(bool));
        dtTable.Columns.Add("TaxApplicable", typeof(bool));

        if (data.Count() > 0)
        {
            foreach (var item in data)
            {
                DataRow dr = dtTable.NewRow();
                dr["Asset"] = item.Asset;
                dr["Category"] = item.Category;
                dr["CoAName"] = item.CoAName;
                dr["Hide"] = item.Hide;
                dr["Recurring"] = item.Recurring;
                dr["TaxApplicable"] = item.TaxApplicable;
                dtTable.Rows.Add(dr);

            }
        }


        coa = dtTable;



    }

Answer 1

It seems that you already have a strongly typed list. Why converting this to a weakly typed DataTable and then back to a list?????

var data = 
    from a in db.CoA
    where a.ParentId == 0 && a.Asset == true
    select new 
    { 
        a.Asset, 
        a.Category, 
        a.CoAName, 
        a.Hide, 
        a.Recurring, 
        a.TaxApplicable 
    };
var list = data.ToList();

If you want to be able to use this list outside the scope of the method, define a type that will hold the different properties and in your select statement use this type instead of the anonymous type like:

var data = 
    from a in db.CoA
    where a.ParentId == 0 && a.Asset == true
    select new MyType
    { 
        Asset = a.Asset, 
        Category = a.Category, 
        CoAName = a.CoAName, 
        Hide = a.Hide, 
        Recurring = a.Recurring, 
        TaxApplicable = a.TaxApplicable 
    };
List<MyType> list = data.ToList();