asp.net - How to create global dataTable in C#? -

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i need use global datatable in .net project. however, cannot handle between 2 methods..

in example, dt1 global datatable , dt2 local, dt2 direct using call method.

result: dt1: don't know how describe it, likes whole html page in excel.

dt2: well!

can tell me why dt1 wrong ? should perfect.. code:

    private datatable dt1;// same result public datatable dt1{ get; private set; }""     protected void page_load(object sender, eventargs e)     {       if (!page.ispostback)       {         datatable dt = new datatable();                 dt.columns.addrange(new datacolumn[3] { new datacolumn("shorturl", typeof(int)),                             new datacolumn("longurl", typeof(string)),                             new datacolumn("creatingdate",typeof(string)) });                 dt.rows.add(1, "john hammond", "united states");                 dt.rows.add(2, "mudassar khan", "india");                 dt.rows.add(3, "suzanne mathews", "france");                 dt.rows.add(4, "robert schidner", "russia");            dt1 = dt;       }     }       protected void btn_click(object sender, eventargs e)      {             datatable dt2 = new datatable();             dt2.columns.addrange(new datacolumn[3] { new datacolumn("shorturl", typeof(int)),                             new datacolumn("longurl", typeof(string)),                             new datacolumn("creatingdate",typeof(string)) });             dt2.rows.add(1, "john hammond", "united states");             dt2.rows.add(2, "mudassar khan", "india");             dt2.rows.add(3, "suzanne mathews", "france");             dt2.rows.add(4, "robert schidner", "russia");         exporttoexcel(dt1);// fail :(        exporttoexcel(dt2);// success!       }

that's cause of condition if (!page.ispostback) , because of in button click event when postback happening not re-loading or populating dt1 , since it's new page request new page instance dt1 not present more. remove condition altogether , test

private datatable dt1; protected void page_load(object sender, eventargs e) {    dt1 = new datatable();             dt.columns.addrange(new datacolumn[3] { new datacolumn("shorturl", typeof(int)),                         new datacolumn("longurl", typeof(string)),                         new datacolumn("creatingdate",typeof(string)) });             dt.rows.add(1, "john hammond", "united states");             dt.rows.add(2, "mudassar khan", "india");             dt.rows.add(3, "suzanne mathews", "france");             dt.rows.add(4, "robert schidner", "russia"); }

(or) store datatable session , re-use like

session["dt"] = dt1;  if(session["dt"] != null)        exporttoexcel((datatable)session["dt"]);

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