drop down menu - C# - Nested KeyValuePairs for a dropdown list -

i have dropdown control placed on winform. today datasource dropdown keyvaluepair<'string','string'> , hence easy directly assign 'displaymember' property of dropdown 'value' keyvaluepair.

one of requirements has caused datasource changed keyvaluepair<'string', keyvaluepair<'string','string'>. poses problems me when run code. thats because 'displaymember' being set 'value' causes dropdown item shown ('ab') (where 'a' , 'b' respective strings in keyvaluepair<'string','string'> of new datasource).

i want assign 'displaymember' property of dropdown 'key' in keyvaluepair<'string','string'> changed datasource.

old requirement -

keyvaluepair<'string','string'>('a','b') 

dropdown item shows - 'b'

new requirement -

keyvaluepair<'string',keyvaluepair<'string','string'>('a', new keyvaluepair<'b','c'>) 

dropdown item should show - 'b'

is possible implement change in dropdowns properties?

have checked datasource shows me top level of key-value pair , not hierarchical model.

unfortunately, can't bind nested properties using displaymember. so, trying set displaymember "value.key" doesn't work. however, suggest making custom type wraps keyvaluepair<string, keyvaluepair<string, string>>> type 1 object , give properties can accessed. here's example:

public partial class form1 : form {     public form1()     {         initializecomponent();          // old way          //list<keyvaluepair<string, keyvaluepair<string, string>>> mylist = new list<keyvaluepair<string, keyvaluepair<string, string>>>();          //mylist.add(new keyvaluepair<string, keyvaluepair<string, string>>("a", new keyvaluepair<string, string>("b", "c")));         //mylist.add(new keyvaluepair<string, keyvaluepair<string, string>>("d", new keyvaluepair<string, string>("e", "f")));         //mylist.add(new keyvaluepair<string, keyvaluepair<string, string>>("g", new keyvaluepair<string, string>("h", "i")));          // new way         list<customkeyvaluepairwrapper> mylist = new list<customkeyvaluepairwrapper>();         mylist.add(new customkeyvaluepairwrapper("a", new keyvaluepair<string, string>("b", "c")));         mylist.add(new customkeyvaluepairwrapper("d", new keyvaluepair<string, string>("e", "f")));         mylist.add(new customkeyvaluepairwrapper("g", new keyvaluepair<string, string>("h", "i")));          combobox1.datasource = mylist;         combobox1.displaymember = "valuekey";     } }  public class customkeyvaluepairwrapper {      public string key { get; private set; }      public keyvaluepair<string, string> value { get; private set; }      public string valuekey     {         { return value.key; }     }      public customkeyvaluepairwrapper(string key, keyvaluepair<string, string> value)     {         key = key;         value = value;     } }