c# - How To generate unique ID for controls inside a User Control -

i have user control in have 1 label.

<asp:label id="lblproductionname"             runat="server"             text="production name come here"> </asp:label> 

i render given uc code behind using function:

private string rendercontrol(control control) {     stringbuilder sb = new stringbuilder();     stringwriter sw = new stringwriter(sb);     htmltextwriter writer = new htmltextwriter(sw);      control.rendercontrol(writer);     return sb.tostring(); } 

after rendering, output string:

<span id="lblproductionname">production name come here</span> 

now, when put 2 instances of same user control, same span id in output string.

i want generate 2 different ids 2 instances of user control. how can generate it?

you might try this:

private dictionary<string, int> controlinstances = new dictionary<string, int>();  private string rendercontrol(control control) {     stringbuilder sb = new stringbuilder();     stringwriter sw = new stringwriter(sb);     htmltextwriter writer = new htmltextwriter(sw);      int index = getoraddcontrolinstancecount(control);      control.clientidmode = clientidmode.static;     control.id = control.gettype().name + index;      control.rendercontrol(writer);      return sb.tostring(); }  private int getoraddcontrolinstancecount(control control) {     string key = control.gettype().name;      if (!controlinstances.containskey(key))     {         controlinstances.add(key, 0);     }      return controlinstances[key]++; } 

more advanced solution maybe use namingcontainer.