c# - Fill generic list from SqlDataReader

Question

How can I add values that a SqlDataReader returns to a generic List? I have a method where I use SqlDataReader to get CategoryID from a

Answer 1

This should work but I suggest you to use using with your connections

    SqlConnection connection = null;
    SqlDataReader reader = null;
    SqlCommand cmd = null;
    List catID = new List();
    try
    {
        connection = new SqlConnection(connectionString);
        cmd = new SqlCommand("select CategoryID from Categories", connection );

        connection.Open();



        dr = cmd.ExecuteReader();
        while (dr.Read())
        {   
            catID.Add(Convert.ToInt32(dr["CategoryID"].ToString()));
        }


    }
    finally
    {
        if (connection  != null)
            connection.Close();
    }
    return catID;