asp.net - c# - How to store ArrayList in ViewState? -

i want store arraylist value in viewstate

but getting error:

"type 'system.data.datarow' in assembly 'system.data, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089' not marked serializable" 

code:

  private void bindgridview()     {         dbconnection.open();         oledbcommand dbcommand = new oledbcommand("select emp_id,emp_name,father_name,gender,designation,department,location emp_master", dbconnection);         oledbdataadapter dbreader1 = new oledbdataadapter(dbcommand);         dataset dsemer = new dataset();          dbreader1.fill(dsemer);         arraylist arrlist = new arraylist();         foreach (datarow dtrow in dsemer.tables[0].rows)         {             arrlist.add(dtrow);         }         //here getting error         viewstate["ds"] = arrlist;         empmastergrid.datasource = dsemer;         empmastergrid.databind();          dbconnection.close();     } 

why need store arraylist in viewstate?

by using viewstate export selected gridview column excel using below code

 private void getcheckboxstates()     {         checkbox chkcol0 = (checkbox)empmastergrid.headerrow.cells[0]                                 .findcontrol("chkcol0");         checkbox chkcol1 = (checkbox)empmastergrid.headerrow.cells[0]                                 .findcontrol("chkcol1");         checkbox chkcol2 = (checkbox)empmastergrid.headerrow.cells[0]                                 .findcontrol("chkcol2");         checkbox chkcol3 = (checkbox)empmastergrid.headerrow.cells[0]                                 .findcontrol("chkcol3");         checkbox chkcol4 = (checkbox)empmastergrid.headerrow.cells[0]                                 .findcontrol("chkcol4");         checkbox chkcol5 = (checkbox)empmastergrid.headerrow.cells[0]                                 .findcontrol("chkcol5");         checkbox chkcol6 = (checkbox)empmastergrid.headerrow.cells[0]                                 .findcontrol("chkcol6");         arraylist arr;          if (viewstate["ds"] == null)         {             arr = new arraylist();         }         else         {             arr = (arraylist)viewstate["ds"];         }         arr.add(chkcol0.checked);         arr.add(chkcol1.checked);         arr.add(chkcol2.checked);         arr.add(chkcol3.checked);         arr.add(chkcol4.checked);         arr.add(chkcol5.checked);         arr.add(chkcol6.checked);         viewstate["ds"] = arr;     } 

any ideas? in advance. edited!

as error sais system.data.datarow not serializable can not store in viewstate.

i suggest make custom class marked serializable contains values need , save arraylist of objects in viewstate. populate these objects in foreach loop data datarow.

example:

the data object

[serializable] public class employee {     public int emp_id,     public string emp_name,     //other properties } 

in bindgridview method

//other code arraylist arrlist = new arraylist(); foreach (datarow dtrow in dsemer.tables[0].rows) {     arrlist.add(new employee     {         emp_id = dtrow[0],         emp_name = dtrow[1],         //other properties     }; } viewstate["ds"] = arrlist;