how to copy all data of dataset to generic list in ado.net

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hi all.
i want to use generic list list<t> in ado.net . currently i am using dataset to copy all my data from database to it . but how can i use generic list...I am asking it becoz i want to bind my
gridview to generic list not to dataset. How can i do it? what i want to do in my DAL is as follows:

XML

namespace datalayer
{
    public class DataLayer
    {
        DataSet dataset;
        SqlDataAdapter dataadapter;
        String constr = ConfigurationManager.ConnectionStrings["Treasury"].ConnectionString;
        SqlConnection connection;
        SqlCommand command;
        DataTable datatable;
        List<string> obj = new List<string>();

        public List<string> fillgridview()
        {
            connection.Open();
                        command = new SqlCommand("spuserdetailsinfo", connection);
                command.CommandType = CommandType.StoredProcedure;
                dataset = new DataSet();
                dataadapter = new SqlDataAdapter();
                dataadapter.SelectCommand = command;
                dataadapter.Fill(dataset);
            obj = List<string> dataset ;

        }

but this line obj = List<string> dataset; is showing error as

Quote:
Error 3 Using the generic type 'System.Collections.Generic.List<t>' requires '1' type arguments d:\substituteofsqlhelp (2)\datalayer\DataLayer.cs 35 19 datalayer

Posted 7-Aug-13 23:48pm

Rambo_Raja

Updated 7-Aug-13 23:50pm

v2

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vyas_pratik20 · Accepted Answer · 2013-08-07T23:56:00

Solution 1

hi , you can do as follow :

XML

List<string> years   = dataSet.Tables[0].AsEnumerable()
                            .Select(r => r.Field<string>(0))
                            .ToList();
List<double> doubles = dataSet.Tables[0].AsEnumerable()
                            .Select(r => r.Field<double>(1))
                            .ToList();

you could not directly assign data to list

Posted 7-Aug-13 23:56pm

vyas_pratik20

Comments

Rambo_Raja 8-Aug-13 6:01am

thanx ....!+5...

Rambo_Raja 8-Aug-13 6:26am

hi...prateek when i use quick watch then it i see count = 5 that is the number of rows..when i bind grid to the years object it says 'A field or property with the name 'name' was not found on the selected data source'. because it is returning int value by which we can't bind gridview how to overcome this problem? thanx...

vyas_pratik20 8-Aug-13 6:31am

I think you might need to add bound filed in data grid with
<asp:BoundField DataField="name" HeaderText="name"
SortExpression="name" />

Rambo_Raja 8-Aug-13 6:35am

no no no...that i have done...i think that the list control return only single column .....is it right?