c# - Why 'innerhtml' does not work properly for 'select' tag -

i trying set innerhtml of html select tag cannot set feature;therefor,i need use outerhtml feature.this way,not code hardcode ,but preposterous.i have read 'innerhtml ie 8 doesn't work properly? resetting form',it did not though.

i appreciate if tell me how set innerhtml feature of html select tag. c# code:

public void setdefaultvalue(string controlid, string controlvalue)  {           system.windows.forms.htmldocument doc = webbrowser1.document;     htmlelement htmlcontrol = doc.getelementbyid(controlid);         string listresult;                     string listinnerhtml = "";         listinnerhtml += "<option value = " + lststring + ">" + lststring + "</option>";                                               listresult = "<select id = " + '"' + htmlcontrol.id + '"' + " type = " + '"' + htmlcontrol.getattribute("type") + '"' + " title = " + '"' +             htmlcontrol.getattribute("title") + '"' + " name = " + '"' + htmlcontrol.name + '"' + " value = " + '"' + htmlcontrol.getattribute("value") +             '"' + " size = \"" + htmlcontrol.getattribute("size") + '"' + htmlcontrol.getattribute("multiple").tostring() + "\">" + listinnerhtml + "</select>";         htmlcontrol.outerhtml = listresult;                     } 

or

string _lsthtml = _htmlel.outerhtml; string[] _parts = controlvalue.split(new char[] { ',' }); string _lstinner = ""; foreach (string _lst in _parts) _lstinner += "<option value=" + _lst + ">" + _lst + "</option>";  _lsthtml = _lsthtml.insert(_lsthtml.indexof(">") + 1, _lstinner); _htmlel.outerhtml = _lsthtml; 

this code works need efficient , clean. returncontroltype function returns type of html tag.

this official internet explorer bug:

bug: internet explorer fails set innerhtml property of select object.

one workaround

you may try adding 1 of following meta tags in document's head:

<meta http-equiv="x-ua-compatible" content="ie=edge" /> 

or

<meta http-equiv="x-ua-compatible" content="ie=10" /> 

you should format option tag's value attribute (enclose lststring in '):

listinnerhtml += "<option value='" + lststring + "'>" + lststring + "</option>"; 

a more reliable solution

as fixes above might workaround code, suggest use more reliable approach. consider adding reference microsoft.mshtml project , modifying method this:

// add top of file containing class using mshtml;  public void setdefaultvalue(string controlid, string controlvalue) {     system.windows.forms.htmldocument doc = webbrowser1.document;     ihtmldocument2 document = doc.domdocument ihtmldocument2;     var sel = doc.getelementbyid(controlid);     htmlselectelement domselect = (htmlselectelement)sel.domelement;     domselect.options.length = 0;     htmloptionelement option;      // here can dynamically add options select element     (int = 0; < 10; i++)     {         option = (htmloptionelement)document.createelement("option");         option.text = string.format("text{0}", i);         option.value = string.format("value{0}", i);         domselect.options.add(option, 0);     } }