ASP DropDownList DataBind DataTextField = 'Lastname/Firstname'?

I successfully bind sql data to a dropdownlist like this:

string sql = "select id, lastname, firstname from clients";

 OracleConnection cn = DataAccess.OpenConnection();
 OracleCommand cmd = new OracleCommand(sql, cn);
 OracleDataAdapter da = new OracleDataAdapter(cmd);
 DataTable dt = new DataTable();        
 cn.Open();
 da.Fill(dt);
 DataAccess.CloseConnection(cn);

 ddl1.DataSource = dt;
 ddl1.DataTextField = dt.Columns["lastname"].ToString();
 ddl1.DataValueField = dt.Columns["id"].ToString();
 ddl1.DataBind();

Now I would like to make the ddl1.DataTextField = dt.Columns["lastname"].ToString() + "/" + dt.Columns["firstname"].ToString();

Help!
pointemanAsked:
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YZlatConnect With a Mentor Commented:
sorry, forgot Oracle uses || instead of +:

string sql = "select id, lastname || '/' || firstname as fullname from clients";

 OracleConnection cn = DataAccess.OpenConnection();
 OracleCommand cmd = new OracleCommand(sql, cn);
 OracleDataAdapter da = new OracleDataAdapter(cmd);
 DataTable dt = new DataTable();         
 cn.Open();
 da.Fill(dt);
 DataAccess.CloseConnection(cn);

 ddl1.DataSource = dt;
 ddl1.DataTextField = dt.Columns["fullname"].ToString();
 ddl1.DataValueField = dt.Columns["id"].ToString();
 ddl1.DataBind();

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YZlatCommented:
string sql = "select id, lastname + '/' + firstname as fullname from clients";

 OracleConnection cn = DataAccess.OpenConnection();
 OracleCommand cmd = new OracleCommand(sql, cn);
 OracleDataAdapter da = new OracleDataAdapter(cmd);
 DataTable dt = new DataTable();         
 cn.Open();
 da.Fill(dt);
 DataAccess.CloseConnection(cn);

 ddl1.DataSource = dt;
 ddl1.DataTextField = dt.Columns["fullname"].ToString();
 ddl1.DataValueField = dt.Columns["id"].ToString();
 ddl1.DataBind();

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pointemanAuthor Commented:
thx
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