c# - asp.net - problems getting dropdownlist -


i using code behind function bind dropdownlist dynamically, when user changes dropdownlist , submit purchase, selectedvalue empty.

i have tried both ddl.selecteditem.tostring(); , ddl.selectedvalue.tostring(); none work. these 2 code behind functions below, can't seem use void methods instead of function needs returning value , parameter, there anyway use void methods without parameters? advice appreciated.

thanks.

<%# formattedsize((string)eval("size")) %> <%# formattedgetsize((string)eval("size")) %>

inline:

<asp:dropdownlist id="dropdownlist1" runat="server" ondatabinding='<%# formattedsize((string)eval("size")) %>'></asp:dropdownlist>  <a href='addtocart.aspx?categoryid=<%# eval("categoryid") %>&&productid=<%# eval("productid" ) %>&&size=<%# formattedgetsize((string)eval("size")) %>' style="border: 0 none white;">

code behind:

   protected string formattedsize(string size)     {         if (size.contains("s"))         {             dropdownlist ddl = (dropdownlist)formview_product.row.cells[0].findcontrol("dropdownlist1");             ddl.items.add("s");         }      if (size.contains("m"))     {         dropdownlist ddl = (dropdownlist)formview_product.row.cells[0].findcontrol("dropdownlist1");         ddl.items.add("m");     }      if (size.contains("f"))     {         dropdownlist ddl = (dropdownlist)formview_product.row.cells[0].findcontrol("dropdownlist1");         ddl.items.add("freesize");     }     return null; }  protected string formattedgetsize(string size) {     dropdownlist ddl = (dropdownlist)formview_product.row.cells[0].findcontrol("dropdownlist1");     string selectedsize = ddl.selecteditem.tostring();     return selectedsize; }

the reason why doesn't work because.. "you're doing wrong". you're expecting <a href=.. change based on user interaction instead generated when user receives page. if want link change based on dropdown, you'd have have either:

  1. a postback on dropdown selection, link change...
  2. you change href javascript attaching event on dropdown selection

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