Question

Im trying to retrieve a datatable that I put into a session variable, however when i do it apears that there are no columns…

I have done this before in VB.NET, I’n now using C#, and it worked perfectly, and as far as i can see there is no change in the code other than the obvious syntax changes.

EDIT:

The dt (in part 2) variable has the right data when i look in the data visulization window, but i have noticed that the other properties associated with a datatable are abscent. When i hover over a normal looking datatable with my mouse it looks like the following: ” dt —– {System.Data.DataTable}” but in the class im working on it just looks like “dt —– {}”. Also, after I return the session variable into the dt I clone it (dtclone = dt.clone(); ) and the clone is empty in the data visulizer…. what on earth!

EDIT 2:

I have now also tried converting the first datatable to a dataset, putting this in the session variable, and recoverting it back to a datatable in the class.

Am starting to wonder if it is a probelm with:

    dt.Load(sqlReader);

The data does appear after this step though in the dataset visualiser, but not after being cloned.

Code below.

All help very welcome!

Thanks in advance

Chris

1) SQL command in a webhandler, the results of which populate the datatable to be put into the session variable.

    DataTable dt = new DataTable();

    SqlDataReader sqlReader= default(SqlDataReader);        
    SqlDataAdapter sqlAdapter = new SqlDataAdapter();

    sqlReader = storedProc.ExecuteReader(CommandBehavior.CloseConnection);

    dt.Load(sqlReader);
    System.Web.HttpContext.Current.Session["ResultsTable"] = dt;

2) Part of the code in a class which performs calculations on the table:

    DataTable dt = (DataTable)HttpContext.Current.Session["ResultsTable"]; 

Answer 1

did you call DataTable dispose after setting Session Var?
Because if you do this, solution is like this:

System.Web.HttpContext.Current.Session["ResultsTable"] = dt.Copy();