Question

I have a list of string lets say

List<string> mia = new list<string>;

and i am adding data to it from a database

using (SqlCommand command = new SqlCommand("SELECT xyz FROM table",sqlConnection1))
{
     sqlConnection1.Open();
     using (SqlDataReader reader = command.ExecuteReader())
     {
          while (reader.Read())
          {
               mia.Add(reader["xyz"].ToString());
          }

     }
     sqlConnection1.Close();                     
}

data is successfully added to it.

combobox.ItemsSource =mia;

even that works fine

But when i try to do

comboOpthol.ItemsSource =mia.Sort();

intellisense throws error Can not implicitly convert type “void” to System.collections.IEnumerable. Why this error is coming. My list have all data then why show it void?
Is there something wrong with way list is defined list?

Answer 1

Because the Sort() method does not have a return value (it sorts the list in place and returns void). You need to sort first and then assign the list to the item source:

mia.Sort();
comboOpthol.ItemsSource = mia;