How to get all list item of ddl and match with another value in if statement but which is not selected and just bind in ddl

<div> Hi,
I want to match one of the list items of dll.
I mean I would like to equal one of the listitems of ddl.
So, I can't use any selected value or selected text coz I did not select anything in my ddl
I just bind ddl>>> here is my code.
   SqlCommand cmd = new SqlCommand("Mac_GetMac", con);             cmd.CommandType = CommandType.StoredProcedure;             SqlDataAdapter adp = new SqlDataAdapter(cmd);             DataTable dt = new DataTable();             adp.Fill(dt);             ddlmac.DataSource = dt;             ddlmac.DataTextField = &quo ...