c# - error creating dynamic controls -


i supposed create label , textbox when checkboxlist event selectedindexchanged fires.

i tried following code, giving me error:

multiple controls same id 'mylab1' found

protected void chkcar_selectedindexchanged(object sender, eventargs e) {     // panel2.controls.clear();     string dat = datetime.parse(gridview1.selectedrow.cells[4].text).tostring("dd-mmm-yyyy");     lblname.text = "";     (int = 0; < chkcar.items.count; i++)     {         int sum = 0;         if (chkcar.items[i].selected == true)         {             panel tt = new panel();             panel2.controls.add(new literalcontrol("<br />"));             label mylab = new label();             mylab.id = "mylab" + nextid1;             mylab.text = "no of persons in " + chkcar.items[i].value;             panel2.controls.add(mylab);             controlslist1.add(mylab.id);              textbox mytext = new textbox();             mytext.id = "mytext" + nextid2;             mytext.text = "";             panel2.controls.add(mytext);             controlslist2.add(mytext.id);         }     } }  protected override void loadviewstate(object savedstate) {     base.loadviewstate(savedstate);     foreach (string lbid in controlslist1)     {         label lb = new label();         lb.id = lbid;         panel2.controls.add(lb);         panel2.controls.add(new literalcontrol("<br>"));     }     foreach (string txtid in controlslist2)     {         textbox tb = new textbox();         tb.id = txtid;         panel2.controls.add(tb);         panel2.controls.add(new literalcontrol("<br>"));     } }  private list<string> controlslist1 //labels {         {         if (viewstate["controls"] == null)         {             viewstate["controls"] = new list<string>();         }         return (list<string>)viewstate["controls"];     }                      }  private list<string> controlslist2 //textboxes {         {         if (viewstate["controls"] == null)         {             viewstate["controls"] = new list<string>();         }         return (list<string>)viewstate["controls"];     } }  private int nextid1//label {         {         return controlslist1.count + 1;     } }  private int nextid2//textbox {         {         return controlslist2.count + 1;     } }

can me knowing i'm going wrong? in advance.

i imagine make work need add newly added controls ids controlslist1 , controlslist2, otherwise nextid1 , nextid2 return same number during for loop.

if (chkcar.items[i].selected == true) {     panel tt = new panel();     panel2.controls.add(new literalcontrol("<br />"));     label mylab = new label();     mylab.id = "mylab" + nextid1;     mylab.text = "no of persons in " + chkcar.items[i].value;     panel2.controls.add(mylab);     controlslist1.add(mylab.id) // <--- here      textbox mytext = new textbox();     mytext.id = "mytext" + nextid2;     mytext.text = "";     panel2.controls.add(mytext);     controlslist2.add(mytext.id) // <--- , here }

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