asp.net - Multiple controls with the same ID '' were found. FindControl requires that controls have unique IDs -

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update:

here observed:

if    org.registrations.count = 1      txtbox.id   "_registration0_0"  string .... ....

if org.registrations.count = 2 act strange

txtbox.id   "_registration2_0"   txtbox.id   "_registration2_1"   after starts again _registration2_0

ps: dont have problem if count = 1

end update

the error messages says trying have duplicate id below creating dynamic textbox, see whats wrong in code? 

protected void gv_rowcreated(object sender, gridviewroweventargs e) {    students org = (namespace.students )(e.row.dataitem);     foreach (registration reg in org.registrations)    {       int _count = org.registrations.count;       (int rowid = 0; rowid < _count; rowid++)       {          textbox txtbox = new textbox();          txtbox.id = "_registration" + e.row.rowindex + "_" + rowid;          txtbox.text = reg.name;          e.row.cells[7].controls.add(txtbox);      }    } }

it seems if have multiple org.registrations end duplicate ids. @ usage of test variable below:

protected void gv_rowcreated(object sender, gridviewroweventargs e) {    students org = (namespace.students )(e.row.dataitem);    int test =0;    foreach (registration reg in org.registrations)    {       test++;       int _count = org.registrations.count;       (int rowid = 0; rowid < _count; rowid++)       {          textbox txtbox = new textbox();          txtbox.id = "_registration" + e.row.rowindex + "_" + rowid + "_" + test.tostring();          txtbox.text = reg.name;          e.row.cells[7].controls.add(txtbox);      }    } }

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