asp.net - Add string values into array list after looping through gridview rows c# -

i using gridview bulk update. after make changes column , hit update button in page, foreach loop executed update. how can add these string values arraylist after looping

protected void btnupdate_click(object sender, eventargs e) {     try     {         foreach (gridviewrow row in gvdetails.rows)         {            string strid = ((label)row.findcontrol("lblid")).text;            string strgroup = ((label)row.findcontrol("lblgrp")).text;            string strvalue = ((textbox)row.findcontrol("txtvalue")).text;              }         arraylist allist = new arraylist();         allist.add(strid);         allist.add(strgroup);         allist.add(strvalue);     }     catch (exception ex)     {      } } 

but values of string after looping not getting inserted arraylist. van me through this.

it looks code should be

var allist = new list<string>(); foreach (gridviewrow row in gvdetails.rows) {        string strid = ((label)row.findcontrol("lblid")).text;        string strgroup = ((label)row.findcontrol("lblgrp")).text;        string strvalue = ((textbox)row.findcontrol("txtvalue")).text;              allist.add(strid);        allist.add(strgroup);        allist.add(strvalue); } 

otherwise you're trying add list variable out of scope (since strid , others has been declared inside loop inner scope)

note: don't use arraylist obsolete. in case it's better use list<string> instead.

or, if missed point , need add list variables last iteration (as can supposed code) - declare strid , other variables outside loop, this:

string strid = null, strgroup = null, strvalue = null; var allist = new list<string>(); foreach (gridviewrow row in gvdetails.rows) {        strid = ((label)row.findcontrol("lblid")).text;        strgroup = ((label)row.findcontrol("lblgrp")).text;        strvalue = ((textbox)row.findcontrol("txtvalue")).text;      } allist.add(strid); allist.add(strgroup); allist.add(strvalue); 

update

since we've clarified in comments goal , need not list<string> rather datatable, code like:

var dt = new datatable(); dt.columns.add("id", typeof(string)); dt.columns.add("group", typeof(string)); dt.columns.add("value", typeof(string));  foreach (gridviewrow row in gvdetails.rows) {        var dro = dt.newrow();        dro["id"] = ((label)row.findcontrol("lblid")).text;        dro["group"] = ((label)row.findcontrol("lblgrp")).text;        dro["value"] = ((textbox)row.findcontrol("txtvalue")).text;         dt.rows.add(dro); } 

also note - data types of datatable columns can any, not strings - depends on actual data want store.