Cannot implicitly convert type sring to string[]...

Question

error ----Cannot implicitly convert type sring to string[]...

Hi,
I am getting above error .
 my code is...

string [] fksprd_id;

cmd = new sqlcommand("select id from table1 where name = ' "+txt.text+" ' ",con);
 da = new SqlDataAdapter(cmd);
                ds = new DataSet();
                da.Fill(ds);
                cmd.Dispose();


 for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {
                    fksprd_id =ds.Tables[0].Rows[i][0].ToString();
                }


i just want to store id in this array but iot shows error like

Cannot implicitly convert type sring to string[]...


..
Thanks in advance..