Convert int datatype to string datatype c# access database -

i created windows application form project , there problem facing right now. problem is: had array of textboxes, , wanted connect database textboxes, however, cannot data because data want connect int datatype.

there 2 form has been created, 1 login form, login form, database string, autocomplete working. second 1 second form, second form, database int, autocomplete not working.

my question is: how convert int datatype string datatype?

here code second form:

string connectionstring = (@"provider=microsoft.ace.oledb.12.0;data source=\archives\projects\program\sell system\sell system\app_data\db1.accdb;persist security info=false;");      private list<list<textbox>> textboxcodecontainer = new list<list<textbox>>();      oledbdatareader dreader;     oledbconnection conn = new oledbconnection(connectionstring);     conn.open();     oledbcommand cmd = new oledbcommand("select distinct [code] [data] order [code] asc", conn);     dreader = cmd.executereader();     autocompletestringcollection codescollection = new autocompletestringcollection();      while (dreader.read())     {     codescollection.add(convert.tostring(dreader.getint32(dreader.getordinal("code")))); // line not working     }  //****textbox code****             (int y = 0; y <= 16; y++)             {                 textboxcodecontainer.add(new list<textbox>());                 textboxcodecontainer[0].add(new textbox());                 textboxcodecontainer[0][y].size = new size(100, 50);                 textboxcodecontainer[0][y].location = new point(25, 150 + (y * 25));                  textboxcodecontainer[0][y].autocompletemode = autocompletemode.suggest;                 textboxcodecontainer[0][y].autocompletesource = autocompletesource.customsource;                 textboxcodecontainer[0][y].autocompletecustomsource = codescollection;                  dreader.close();                 conn.close();                  controls.add(textboxcodecontainer[0][y]);             } 

edit: data type code number, field size long integer , format 0000.. 0 behind replaced number "1", "2" , on.

edit: *complete code****

using system; using system.collections.generic; using system.componentmodel; using system.data; using system.drawing; using system.linq; using system.text; using system.windows.forms; using system.security.principal; using system.data.oledb;  namespace sell_system {     public partial class form2 : form     {         string connectionstring = (@"provider=microsoft.ace.oledb.12.0;data source=\archives\projects\program\sell system\sell system\app_data\db1.accdb;persist security info=false;");         private form1 firstform;         private list<list<textbox>> textboxcodecontainer = new list<list<textbox>>();         private list<list<textbox>> textboxquantitycontainer = new list<list<textbox>>();         private list<list<textbox>> textboxdesccontainer = new list<list<textbox>>();         private list<list<textbox>> textboxsubtotalcontainer = new list<list<textbox>>();         private list<list<textbox>> textboxtotalcontainer = new list<list<textbox>>();          public form2()         {             initializecomponent();         }          public form2(form1 firstform)             : this()         {             this.firstform = firstform;         }          private void form2_load(object sender, eventargs e)         {             //var int num = 10;              oledbdatareader dreader;             oledbconnection conn = new oledbconnection(connectionstring);             conn.open();             oledbcommand cmd = new oledbcommand("select distinct [code] [data] order [code] asc", conn);             dreader = cmd.executereader();             autocompletestringcollection codescollection = new autocompletestringcollection();              while (dreader.read())             {                 codescollection.add(convert.tostring(dreader.getint32(dreader.getordinal("code"))));                 //codescollection.add(convert.tostring(num);             }              if (firstform.combobox1.selectedindex == 0)             {                 label1.text = "code:";                 label1.location = new point(60, 125);                 label2.text = "welcome selling system.";                 label2.location = new point(600, 0);                 label3.text = "quantity:";                 label3.location = new point(155, 125);                 label4.text = "description:";                 label4.location = new point(580, 125);                 label5.text = "sub total on rp:";                 label5.location = new point(1020, 125);                 label6.text = "total on rp:";                 label6.location = new point(1210, 125);                 label7.text = "total on rp:";                 label7.location = new point(1080, 580);             }              else if (firstform.combobox1.selectedindex == 1)             {                 label1.text = "kode:";                 label1.location = new point(60, 125);                 label2.text = "selamat datang di selling system.";                 label2.location = new point(600, 0);                 label3.text = "banyaknya:";                 label3.location = new point(145, 125);                 label4.text = "keterangan:";                 label4.location = new point(580, 125);                 label5.text = "sub total di rp:";                 label5.location = new point(1020, 125);                 label6.text = "total di rp:";                 label6.location = new point(1210, 125);                 label7.text = "total di rp:";                 label7.location = new point(1080, 580);             }              //****textbox code****             (int y = 0; y <= 16; y++)             {                 textboxcodecontainer.add(new list<textbox>());                 textboxcodecontainer[0].add(new textbox());                 textboxcodecontainer[0][y].size = new size(100, 50);                 textboxcodecontainer[0][y].location = new point(25, 150 + (y * 25));                  textboxcodecontainer[0][y].autocompletemode = autocompletemode.suggest;                 textboxcodecontainer[0][y].autocompletesource = autocompletesource.customsource;                 textboxcodecontainer[0][y].autocompletecustomsource = codescollection;                  dreader.close();                 conn.close();                  controls.add(textboxcodecontainer[0][y]);             }              //****textbox quantity****             (int y = 0; y <= 16; y++)             {                 textboxquantitycontainer.add(new list<textbox>());                 textboxquantitycontainer[0].add(new textbox());                 textboxquantitycontainer[0][y].size = new size(100, 50);                 textboxquantitycontainer[0][y].location = new point(125, 150 + (y * 25));                  controls.add(textboxquantitycontainer[0][y]);             }              //****textbox description****             (int y = 0; y <= 16; y++)             {                 textboxdesccontainer.add(new list<textbox>());                 textboxdesccontainer[0].add(new textbox());                 textboxdesccontainer[0][y].size = new size(750, 50);                 textboxdesccontainer[0][y].location = new point(225, 150 + (y * 25));                  controls.add(textboxdesccontainer[0][y]);             }              //****textbox sub total****             (int y = 0; y <= 16; y++)             {                 textboxsubtotalcontainer.add(new list<textbox>());                 textboxsubtotalcontainer[0].add(new textbox());                 textboxsubtotalcontainer[0][y].size = new size(175, 50);                 textboxsubtotalcontainer[0][y].location = new point(975, 150 + (y * 25));                  controls.add(textboxsubtotalcontainer[0][y]);             }              //****textbox total****             (int y = 0; y <= 16; y++)             {                 textboxtotalcontainer.add(new list<textbox>());                 textboxtotalcontainer[0].add(new textbox());                 textboxtotalcontainer[0][y].size = new size(175, 50);                 textboxtotalcontainer[0][y].location = new point(1150, 150 + (y * 25));                  controls.add(textboxtotalcontainer[0][y]);             }              //****textbox total all****             textbox textboxalltotal = new textbox();             textboxalltotal.size = new size(175, 50);             textboxalltotal.location = new point(1150, 575);              controls.add(textboxalltotal);         }     } } 

my question is: how convert int datatype string datatype?

string s = convert.tostring(yourintvalue);