How to save List of object in to session variable

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How to save List of object in to session variable?

here getting the error

Unable to cast object of type EMONBL.PersonList to type System.Data.DataSet'.

C#

using (PersonList pList = new PersonList())
            {
                Session["name"] = (PersonList)pList.GetRoleTypePersonDetails();

                DataTable dt = new DataTable();
                DataSet ds=new DataSet();
                try
                {
                    if (Session["name"] != null)
                    {
                        ds = (DataSet)Session["name"];
                        DataView dv = new DataView(ds.Tables[0]);
                        string s = "User";
                        dv.RowFilter = "name=" + s + "";
                        DataTable dt1 = new DataTable();
                        dt1 = dv.ToTable();
                        DropDownList1.DataSource = dt1;
                        DropDownList1.DataTextField = "lastName";
                        DropDownList1.DataValueField = "ID";
                        DropDownList1.DataBind();
                    }

Posted 5-Jun-12 3:29am

kamal-kondi

Updated 5-Jun-12 3:36am

Mehdi Gholam

v2

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Sandeep Mewara · Answer 1 · 2012-06-05T03:41:00

Unable to cast object of type EMONBL.PersonList to type System.Data.DataSet'.

C#

//...
Session["name"] = (PersonList)pList.GetRoleTypePersonDetails();
//...
ds = (DataSet)Session["name"];

You get this error as there is a datatype mismatch. Earlier, you stored an object of type 'PersonList' in Session. But, later, you try to use the same session and cast it into a DataSet.
DataSet class is different from PersonList object and hence compiler fails to convert/cast it as asked and throws an error.

It looks like you want to have a datasource for your dropdown. Convert or have the PersonList of datatype that can be a datasource directly or else, convert the data into a format that can be used as a datasource.