asp.net - How to Change RadioButton State from code behind -

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i have radiobutton declared in page below :

<asp:radiobutton  id="radiosalesmanager" runat="server" groupname="radiosales"  />   <asp:radiobutton id="radiosalesuser" runat="server"  groupname="radiosales"/>

in code behind based on value of dropdown want change state of radiobutton

protected void radiobuttonlist1_selectedindexchanged(object sender, eventargs e)     {         strrole = ((radiobuttonlist)createuserwizard1.createuserstep.contenttemplatecontainer.findcontrol("radiobuttonlist1")).selectedvalue;          if (strrole.contains("administrator"))         {             ((dropdownlist)createuserwizard1.createuserstep.contenttemplatecontainer.findcontrol("drpgrplist")).selectedvalue = strrole.trim();             ((dropdownlist)createuserwizard1.createuserstep.contenttemplatecontainer.findcontrol("drpgrplist")).enabled = false;             ((system.web.ui.htmlcontrols.htmltablerow)createuserwizard1.createuserstep.contenttemplatecontainer.findcontrol("traccess")).visible = false;          }         else         {                ((dropdownlist)createuserwizard1.createuserstep.contenttemplatecontainer.findcontrol("drpgrplist")).enabled = true;                     ((system.web.ui.htmlcontrols.htmltablerow)createuserwizard1.createuserstep.contenttemplatecontainer.findcontrol("traccess")).visible = true;                     strgroupname = ((dropdownlist)createuserwizard1.createuserstep.contenttemplatecontainer.findcontrol("drpgrplist")).selectedvalue;                      if (strgroupname.contains("sales") && (strrole.contains("manager")))                         ((system.web.ui.webcontrols.radiobutton)createuserwizard1.createuserstep.contenttemplatecontainer.findcontrol("radiosalesmanager")).checked = true;                     else                         if (strgroupname.contains("sales") && (strrole.contains("user")))                             ((system.web.ui.webcontrols.radiobutton)createuserwizard1.createuserstep.contenttemplatecontainer.findcontrol("radiosalesuser")).checked = true;          }     }

the radio button state doesn't change above code behind code . please me in fixing issue .

thanks appu

do use updatepanel in aspx-page?

<asp:updatepanel id="update" runat="server" childrenastriggers="true" updatemode="conditional">

this needed update data in frontend, has been changed in code behind


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