Drag and down a combobox from toolbox and 3 text box for ID,name, and age.  Make a function for getting database value (Name) in combobox and after click at  any name then show all detail of that respected persion.
  Click  on combobox in write  this code
  {
      string str = "server  = MUNESH\\SQL2008R2;Database=datastore;UID=sa;Password=123;";
       SqlConnection con = new SqlConnection(str);
      string query =  "select * from tablename where name = '"+combobox1.text+"'  ";
       SqlCommand cmd = new SqlCommand( query,con);
       sqldatareader dbr;
      try
      {
           con.open();
          dbr  = cmd.executereader();
          while(dbr.read())
          {
              string sID = (string)  dbr["ID"].tostring;
              string sname = (string)  dbr["name"] // name  is string value 
              string sage = (string)  dbr["age"].tostring; 
               textbox1.text = sid;
               textbox2.text = sname;
               textbox3.text = sage; 
   
          }
          catch(execption es)
          {
              messagebox.show(es.message);
          } 
      }
  }