c# - How to add CheckBox, Label and DDL to ASP.NET page programmatically? -

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i trying add check box, label , ddl asp.net page (aspx) class in c#. have been using literalcontrol _litext = new literalcontrol(); attach label can show them using this.controls.add(_litext);in createchildcontrols() method.

how add ddl , check box asp.net page c# code label in same line ddl , checkbox?

i have made ddl using syntax:

list<dropdownlist> _ddlcollection=new list<dropdownlist>(); (int = 0; < 5; i++)             {                 _ddlcollection.add(new dropdownlist());             }

problem not in this.controls.add() call createchildcontrols(). onprerender() method fill ddl , check box. literalcontrol class this? here have tried in onprerender():

 foreach (splist list in web.lists)             {                 if (!list.hidden)                 {                     _litext.text += @<input type="checkbox">;                     _litext.text += list.title + "<br />";                  }             }

first, should add placeholder.

<form id="form1" runat="server">     <asp:placeholder runat="server" id="phmain"></asp:placeholder> </form>

next, if have add in 1 line use table (it simple not recommended method, next step add page , set css style page).

protected override void createchildcontrols() {     base.createchildcontrols();     table table = new table();     (int = 0; < 3; i++)     {         tablerow tr = new tablerow();          tablecell tc1 = new tablecell();         tc1.controls.add(new literalcontrol(string.format("line {0}",i)));         tr.cells.add(tc1);          tablecell tc2 = new tablecell();         checkbox chb = new checkbox();         chb.id = string.format("checkbox_{0}", i);         chb.text = string.format("checkbox {0}", i);         chb.checkedchanged += chb_checkedchanged;         chb.autopostback = true;         tc2.controls.add(chb);         tr.cells.add(tc2);          tablecell tc3 = new tablecell();         dropdownlist ddl = new dropdownlist();         ddl.id = string.format("dropdownlist_{0}", i);         ddl.items.add("1111");         ddl.items.add("2222");         ddl.items.add("3333");         ddl.selectedindex = i;         ddl.enabled = false;         tc3.controls.add(ddl);         tr.cells.add(tc3);           table.rows.add(tr);     }     phmain.controls.add(table); }  void chb_checkedchanged(object sender, eventargs e) {     checkbox chb = sender checkbox;     string ddlid = chb.id.replace("checkbox", "dropdownlist");     dropdownlist ddl = this.page.findcontrol(ddlid) dropdownlist;     if (ddl != null)     {         ddl.enabled = chb.checked;     } }

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